Riemann hypothesis

Riemann hypothesis (Redirected from Critical line theorem) Jump to navigation Jump to search For the musical term, see Riemannian theory. The real part (vermelho) and imaginary part (azul) of the Riemann zeta function along the critical line Re(s) = 1/2. The first nontrivial zeros can be seen at Im(s) = ±14.135, ±21.022 and ±25.011. 0:23 Animation showing in 3D the Riemann zeta function critical strip (azul), critical line (vermelho) and zeroes (cross between red and orange): [x,y,z] = [Re(ζ(r + it), Eu estou(ζ(r + it), t] com 0.1 ≤ r ≤ 0.9 e 1 ≤ t ≤ 51 Riemann zeta function along critical line Re(s) = 1/2 (real values are on the horizontal axis and imaginary values are on the vertical axis): Re(ζ(1/2 + it), Eu estou(ζ(1/2 + it) with t ranging between −30 and 30 Millennium Prize Problems Birch and Swinnerton-Dyer conjecture Hodge conjecture Navier–Stokes existence and smoothness P versus NP problem Poincaré conjecture (solved) Riemann hypothesis Yang–Mills existence and mass gap vte In mathematics, the Riemann hypothesis is a conjecture that the Riemann zeta function has its zeros only at the negative even integers and complex numbers with real part 1 / 2 . Many consider it to be the most important unsolved problem in pure mathematics.[1] It is of great interest in number theory because it implies results about the distribution of prime numbers. It was proposed by Bernhard Riemann (1859), depois de quem é nomeado.

The Riemann hypothesis and some of its generalizations, along with Goldbach's conjecture and the twin prime conjecture, make up Hilbert's eighth problem in David Hilbert's list of twenty-three unsolved problems; it is also one of the Clay Mathematics Institute's Millennium Prize Problems, which offers a million dollars to anyone who solves any of them. The name is also used for some closely related analogues, such as the Riemann hypothesis for curves over finite fields.

The Riemann zeta function ζ(s) is a function whose argument s may be any complex number other than 1, and whose values are also complex. It has zeros at the negative even integers; isso é, ζ(s) = 0 when s is one of −2, −4, −6, .... These are called its trivial zeros. The zeta function is also zero for other values of s, which are called nontrivial zeros. The Riemann hypothesis is concerned with the locations of these nontrivial zeros, and states that: The real part of every nontrivial zero of the Riemann zeta function is 1 / 2 .

Desta forma, if the hypothesis is correct, all the nontrivial zeros lie on the critical line consisting of the complex numbers 1 / 2 + i t, where t is a real number and i is the imaginary unit.

Conteúdo 1 Riemann zeta function 2 Origin 3 Consequências 3.1 Distribution of prime numbers 3.2 Growth of arithmetic functions 3.3 Lindelöf hypothesis and growth of the zeta function 3.4 Large prime gap conjecture 3.5 Analytic criteria equivalent to the Riemann hypothesis 3.6 Consequences of the generalized Riemann hypothesis 3.7 Excluded middle 3.7.1 Littlewood's theorem 3.7.2 Gauss's class number conjecture 3.7.3 Growth of Euler's totient 4 Generalizations and analogs 4.1 Dirichlet L-series and other number fields 4.2 Function fields and zeta functions of varieties over finite fields 4.3 Arithmetic zeta functions of arithmetic schemes and their L-factors 4.4 Selberg zeta functions 4.5 Ihara zeta functions 4.6 Montgomery's pair correlation conjecture 4.7 Other zeta functions 5 Attempted proofs 5.1 Operator theory 5.2 Lee–Yang theorem 5.3 Turán's result 5.4 Noncommutative geometry 5.5 Hilbert spaces of entire functions 5.6 Quasicrystals 5.7 Arithmetic zeta functions of models of elliptic curves over number fields 5.8 Multiple zeta functions 6 Location of the zeros 6.1 Number of zeros 6.2 Theorem of Hadamard and de la Vallée-Poussin 6.3 Zero-free regions 7 Zeros on the critical line 7.1 Hardy–Littlewood conjectures 7.2 Selberg's zeta function conjecture 7.3 Numerical calculations 7.4 Gram points 8 Arguments for and against the Riemann hypothesis 9 Notas 10 Referências 10.1 Popular expositions 11 External links Riemann zeta function The Riemann zeta function is defined for complex s with real part greater than 1 by the absolutely convergent infinite series {estilo de exibição zeta (s)=soma _{n=1}^{infty }{fratura {1}{n^{s}}}={fratura {1}{1^{s}}}+{fratura {1}{2^{s}}}+{fratura {1}{3^{s}}}+cdots } Leonhard Euler already considered this series in the 1730s for real values of s, in conjunction with his solution to the Basel problem. He also proved that it equals the Euler product {estilo de exibição zeta (s)=prod_{p{texto{ melhor}}}{fratura {1}{1-p^{-s}}}={fratura {1}{1-2^{-s}}}cdot {fratura {1}{1-3^{-s}}}cdot {fratura {1}{1-5^{-s}}}cdot {fratura {1}{1-7^{-s}}}cdot {fratura {1}{1-11^{-s}}}cdots } where the infinite product extends over all prime numbers p.[2] The Riemann hypothesis discusses zeros outside the region of convergence of this series and Euler product. To make sense of the hypothesis, it is necessary to analytically continue the function to obtain a form that is valid for all complex s. Because the zeta function is meromorphic, all choices of how to perform this analytic continuation will lead to the same result, by the identity theorem. A first step in this continuation observes that the series for the zeta function and the Dirichlet eta function satisfy the relation {estilo de exibição à esquerda(1-{fratura {2}{2^{s}}}certo)zeta (s)=eta (s)=soma _{n=1}^{infty }{fratura {(-1)^{n+1}}{n^{s}}}={fratura {1}{1^{s}}}-{fratura {1}{2^{s}}}+{fratura {1}{3^{s}}}-cdots ,} within the region of convergence for both series. No entanto, the eta function series on the right converges not just when the real part of s is greater than one, but more generally whenever s has positive real part. Desta forma, the zeta function can be redefined as {estilo de exibição eta (s)/(1-2/2^{s})} , extending it from Re(s) > 1 to a larger domain: Re(s) > 0, except for the points where {displaystyle 1-2/2^{s}} é zero. These are the points {displaystyle s=1+2pi in/log 2} Onde {estilo de exibição m} can be any nonzero integer; the zeta function can be extended to these values too by taking limits (see Dirichlet eta function § Landau's problem with ζ(s) = η(s)/0 and solutions), giving a finite value for all values of s with positive real part except for the simple pole at s = 1.

In the strip 0 < Re(s) < 1 this extension of the zeta function satisfies the functional equation {displaystyle zeta (s)=2^{s}pi ^{s-1} sin left({frac {pi s}{2}}right) Gamma (1-s) zeta (1-s).} One may then define ζ(s) for all remaining nonzero complex numbers s (Re(s) ≤ 0 and s ≠ 0) by applying this equation outside the strip, and letting ζ(s) equal the right-hand side of the equation whenever s has non-positive real part (and s ≠ 0). If s is a negative even integer then ζ(s) = 0 because the factor sin(πs/2) vanishes; these are the trivial zeros of the zeta function. (If s is a positive even integer this argument does not apply because the zeros of the sine function are cancelled by the poles of the gamma function as it takes negative integer arguments.) The value ζ(0) = −1/2 is not determined by the functional equation, but is the limiting value of ζ(s) as s approaches zero. The functional equation also implies that the zeta function has no zeros with negative real part other than the trivial zeros, so all non-trivial zeros lie in the critical strip where s has real part between 0 and 1. Origin ...es ist sehr wahrscheinlich, dass alle Wurzeln reell sind. Hiervon wäre allerdings ein strenger Beweis zu wünschen; ich habe indess die Aufsuchung desselben nach einigen flüchtigen vergeblichen Versuchen vorläufig bei Seite gelassen, da er für den nächsten Zweck meiner Untersuchung entbehrlich schien. ...it is very probable that all roots are real. Of course one would wish for a rigorous proof here; I have for the time being, after some fleeting vain attempts, provisionally put aside the search for this, as it appears dispensable for the immediate objective of my investigation. — Riemann's statement of the Riemann hypothesis, from (Riemann 1859). (He was discussing a version of the zeta function, modified so that its roots (zeros) are real rather than on the critical line.) Riemann's original motivation for studying the zeta function and its zeros was their occurrence in his explicit formula for the number of primes π(x) less than or equal to a given number x, which he published in his 1859 paper "On the Number of Primes Less Than a Given Magnitude". His formula was given in terms of the related function {displaystyle Pi (x)=pi (x)+{tfrac {1}{2}}pi (x^{frac {1}{2}})+{tfrac {1}{3}}pi (x^{frac {1}{3}})+{tfrac {1}{4}}pi (x^{frac {1}{4}})+{tfrac {1}{5}}pi (x^{frac {1}{5}})+{tfrac {1}{6}}pi (x^{frac {1}{6}})+cdots } which counts the primes and prime powers up to x, counting a prime power pn as 1⁄n. The number of primes can be recovered from this function by using the Möbius inversion formula, {displaystyle {begin{aligned}pi (x)&=sum _{n=1}^{infty }{frac {mu (n)}{n}}Pi (x^{frac {1}{n}})\&=Pi (x)-{frac {1}{2}}Pi (x^{frac {1}{2}})-{frac {1}{3}}Pi (x^{frac {1}{3}})-{frac {1}{5}}Pi (x^{frac {1}{5}})+{frac {1}{6}}Pi (x^{frac {1}{6}})-cdots ,end{aligned}}} where μ is the Möbius function. Riemann's formula is then {displaystyle Pi _{0}(x)=operatorname {li} (x)-sum _{rho }operatorname {li} (x^{rho })-log 2+int _{x}^{infty }{frac {dt}{t(t^{2}-1)log t}}} where the sum is over the nontrivial zeros of the zeta function and where Π0 is a slightly modified version of Π that replaces its value at its points of discontinuity by the average of its upper and lower limits: {displaystyle Pi _{0}(x)=lim _{varepsilon to 0}{frac {Pi (x-varepsilon )+Pi (x+varepsilon )}{2}}.} The summation in Riemann's formula is not absolutely convergent, but may be evaluated by taking the zeros ρ in order of the absolute value of their imaginary part. The function li occurring in the first term is the (unoffset) logarithmic integral function given by the Cauchy principal value of the divergent integral {displaystyle operatorname {li} (x)=int _{0}^{x}{frac {dt}{log t}}.} The terms li(xρ) involving the zeros of the zeta function need some care in their definition as li has branch points at 0 and 1, and are defined (for x > 1) by analytic continuation in the complex variable ρ in the region Re(r) > 0, ou seja. they should be considered as Ei(ρ log x). The other terms also correspond to zeros: the dominant term li(x) comes from the pole at s = 1, considered as a zero of multiplicity −1, and the remaining small terms come from the trivial zeros. For some graphs of the sums of the first few terms of this series see Riesel & Göhl (1970) or Zagier (1977).

This formula says that the zeros of the Riemann zeta function control the oscillations of primes around their "esperado" posições. Riemann knew that the non-trivial zeros of the zeta function were symmetrically distributed about the line s = 1/2 + it, and he knew that all of its non-trivial zeros must lie in the range 0 ≤ Re(s) ≤ 1. He checked that a few of the zeros lay on the critical line with real part 1/2 and suggested that they all do; this is the Riemann hypothesis.

The result has caught the imagination of most mathematicians because it is so unexpected, connecting two seemingly unrelated areas in mathematics; nomeadamente, number theory, which is the study of the discrete, and complex analysis, which deals with continuous processes. (Burton 2006, p. 376) Consequences The practical uses of the Riemann hypothesis include many propositions known to be true under the Riemann hypothesis, and some that can be shown to be equivalent to the Riemann hypothesis.

Distribution of prime numbers Riemann's explicit formula for the number of primes less than a given number in terms of a sum over the zeros of the Riemann zeta function says that the magnitude of the oscillations of primes around their expected position is controlled by the real parts of the zeros of the zeta function. In particular the error term in the prime number theorem is closely related to the position of the zeros. Por exemplo, if β is the upper bound of the real parts of the zeros, então [3] {estilo de exibição pi (x)-nome do operador {li} (x)=Esquerda(x^{beta }log xright).} It is already known that 1/2 ≤ β ≤ 1.[4] Von Koch (1901) proved that the Riemann hypothesis implies the "best possible" bound for the error of the prime number theorem. A precise version of Koch's result, due to Schoenfeld (1976), says that the Riemann hypothesis implies {estilo de exibição |pi (x)-nome do operador {li} (x)|<{frac {1}{8pi }}{sqrt {x}}log(x),qquad {text{for all }}xgeq 2657,} where {displaystyle pi (x)} is the prime-counting function, {displaystyle operatorname {li} (x)} is the logarithmic integral function, {displaystyle log(x)} is the natural logarithm of x. Schoenfeld (1976) also showed that the Riemann hypothesis implies {displaystyle |psi (x)-x|<{frac {1}{8pi }}{sqrt {x}}log ^{2}x,qquad {text{for all }}xgeq 73.2,} where {displaystyle psi (x)} is Chebyshev's second function. Dudek (2014) proved that the Riemann hypothesis implies that for all {displaystyle xgeq 2} there is a prime {displaystyle p} satisfying {displaystyle x-{frac {4}{pi }}{sqrt {x}}log x 5040 if and only if the Riemann hypothesis is true, where γ is the Euler–Mascheroni constant.

A related bound was given by Jeffrey Lagarias in 2002, who proved that the Riemann hypothesis is equivalent to the statement that: {estilo de exibição sigma (n) 1, Onde {estilo de exibição H_{n}} is the nth harmonic number.[6] The Riemann hypothesis is also true if and only if the inequality {estilo de exibição {fratura {n}{varphi (n)}} 0 {soma de estilo de exibição _{i=1}^{m}|F_{n}(eu)-{tfrac {eu}{m}}|=Esquerda(n^{{fratura {1}{2}}+épsilon }certo)} is equivalent to the Riemann hypothesis. Aqui {displaystyle m=sum _{i=1}^{n}phi (eu)} is the number of terms in the Farey sequence of order n.

For an example from group theory, if g(n) is Landau's function given by the maximal order of elements of the symmetric group Sn of degree n, then Massias, Nicolas & Robin (1988) showed that the Riemann hypothesis is equivalent to the bound {displaystyle log g(n)<{sqrt {operatorname {Li} ^{-1}(n)}}} for all sufficiently large n. Lindelöf hypothesis and growth of the zeta function The Riemann hypothesis has various weaker consequences as well; one is the Lindelöf hypothesis on the rate of growth of the zeta function on the critical line, which says that, for any ε > 0, {displaystyle zeta left({fratura {1}{2}}+itright)=O(t^{varepsilon }),} Como {estilo de exibição para infty } .

The Riemann hypothesis also implies quite sharp bounds for the growth rate of the zeta function in other regions of the critical strip. Por exemplo, it implies that {estilo de exibição e^{gama }leq limsup _{trightarrow +infty }{fratura {|zeta (1+it)|}{log log t}}leq 2e^{gama }} {estilo de exibição {fratura {6}{pi^{2}}}e^{gama }leq limsup _{trightarrow +infty }{fratura {1/|zeta (1+it)|}{log log t}}leq {fratura {12}{pi^{2}}}e^{gama }} so the growth rate of ζ(1+it) and its inverse would be known up to a factor of 2.[8] Large prime gap conjecture The prime number theorem implies that on average, the gap between the prime p and its successor is log p. No entanto, some gaps between primes may be much larger than the average. Cramér proved that, assumindo a hipótese de Riemann, every gap is O(√p log p). This is a case in which even the best bound that can be proved using the Riemann hypothesis is far weaker than what seems true: Cramér's conjecture implies that every gap is O((log p)2), que, while larger than the average gap, is far smaller than the bound implied by the Riemann hypothesis. Numerical evidence supports Cramér's conjecture.[9] Analytic criteria equivalent to the Riemann hypothesis Many statements equivalent to the Riemann hypothesis have been found, though so far none of them have led to much progress in proving (or disproving) it. Some typical examples are as follows. (Others involve the divisor function σ(n).) The Riesz criterion was given by Riesz (1916), to the effect that the bound {displaystyle -sum _{k=1}^{infty }{fratura {(-x)^{k}}{(k-1)!zeta (2k)}}=Esquerda(x^{{fratura {1}{4}}+épsilon }certo)} holds for all ε > 0 if and only if the Riemann hypothesis holds.

Nyman (1950) proved that the Riemann hypothesis is true if and only if the space of functions of the form {estilo de exibição f(x)=soma _{nu =1}^{n}c_{não }rho left({fratura {teta _{não }}{x}}certo)} where ρ(z) is the fractional part of z, 0 ≤ θν ≤ 1, e {soma de estilo de exibição _{nu =1}^{n}c_{não }teta _{não }=0} , is dense in the Hilbert space L2(0,1) of square-integrable functions on the unit interval. Beurling (1955) extended this by showing that the zeta function has no zeros with real part greater than 1/p if and only if this function space is dense in Lp(0,1). This Nyman-Beurling criterion was strengthened by Baez-Duarte [10] to the case where {estilo de exibição teta _{não }dentro {1/k}_{kgeq 1}} .

Salem (1953) showed that the Riemann hypothesis is true if and only if the integral equation {estilo de exibição int _{0}^{infty }{fratura {z^{-sigma -1}phi (z)}{{e^{x/z}}+1}},dz=0} has no non-trivial bounded solutions {estilo de exibição phi } por {displaystyle 1/22}(-1)^{(p+1)/2}x^{p}=+infty ,} which says that primes 3 mod 4 are more common than primes 1 mod 4 in some sense. (For related results, see Prime number theorem § Prime number race.) Dentro 1923 Hardy and Littlewood showed that the generalized Riemann hypothesis implies a weak form of the Goldbach conjecture for odd numbers: that every sufficiently large odd number is the sum of three primes, though in 1937 Vinogradov gave an unconditional proof. Dentro 1997 Deshouillers, Effinger, te Riele, and Zinoviev showed that the generalized Riemann hypothesis implies that every odd number greater than 5 is the sum of three primes. Dentro 2013 Harald Helfgott proved the ternary Goldbach conjecture without the GRH dependence, subject to some extensive calculations completed with the help of David J. Platt. Dentro 1934, Chowla showed that the generalized Riemann hypothesis implies that the first prime in the arithmetic progression a mod m is at most Km2log(m)2 for some fixed constant K. Dentro 1967, Hooley showed that the generalized Riemann hypothesis implies Artin's conjecture on primitive roots. Dentro 1973, Weinberger showed that the generalized Riemann hypothesis implies that Euler's list of idoneal numbers is complete. Weinberger (1973) showed that the generalized Riemann hypothesis for the zeta functions of all algebraic number fields implies that any number field with class number 1 is either Euclidean or an imaginary quadratic number field of discriminant −19, −43, −67, or −163. Dentro 1976, G. Miller showed that the generalized Riemann hypothesis implies that one can test if a number is prime in polynomial time via the Miller test. Dentro 2002, Manindra Agrawal, Neeraj Kayal and Nitin Saxena proved this result unconditionally using the AKS primality test. Odlyzko (1990) discussed how the generalized Riemann hypothesis can be used to give sharper estimates for discriminants and class numbers of number fields. Ono & Soundararajan (1997) showed that the generalized Riemann hypothesis implies that Ramanujan's integral quadratic form x2 + ano 2 + 10z2 represents all integers that it represents locally, with exactly 18 exceptions. Excluded middle Some consequences of the RH are also consequences of its negation, and are thus theorems. In their discussion of the Hecke, Deuring, Mordell, Heilbronn theorem, Ireland & Rosen (1990, p. 359) say The method of proof here is truly amazing. If the generalized Riemann hypothesis is true, then the theorem is true. If the generalized Riemann hypothesis is false, then the theorem is true. Desta forma, the theorem is true!! (punctuation in original) Care should be taken to understand what is meant by saying the generalized Riemann hypothesis is false: one should specify exactly which class of Dirichlet series has a counterexample.

Littlewood's theorem This concerns the sign of the error in the prime number theorem. It has been computed that π(x) < li(x) for all x ≤ 1025 (see this table), and no value of x is known for which π(x) > li(x).

Dentro 1914 Littlewood proved that there are arbitrarily large values of x for which {estilo de exibição pi (x)>operatorname {li} (x)+{fratura {1}{3}}{fratura {quadrado {x}}{log x}}log log log x,} and that there are also arbitrarily large values of x for which {estilo de exibição pi (x)C{fratura {quadrado {|D|}}{registro |D|}}.} Teorema (Deuring; 1933) — If the RH is false then h(D) > 1 E se |D| is sufficiently large.

Teorema (Mordell; 1934) — If the RH is false then h(D) → ∞ as D → −∞.

Teorema (Heilbronn; 1934) — If the generalized RH is false for the L-function of some imaginary quadratic Dirichlet character then h(D) → ∞ as D → −∞.

(In the work of Hecke and Heilbronn, the only L-functions that occur are those attached to imaginary quadratic characters, and it is only for those L-functions that GRH is true or GRH is false is intended; a failure of GRH for the L-function of a cubic Dirichlet character would, strictly speaking, mean GRH is false, but that was not the kind of failure of GRH that Heilbronn had in mind, so his assumption was more restricted than simply GRH is false.) Dentro 1935, Carl Siegel later strengthened the result without using RH or GRH in any way.

Growth of Euler's totient In 1983 J. eu. Nicolas proved that {estilo de exibição varphi (n)0,} where λ(n) is the Liouville function given by (−1)r if n has r prime factors. He showed that this in turn would imply that the Riemann hypothesis is true. But Haselgrove (1958) proved that T(x) is negative for infinitely many x (and also disproved the closely related Pólya conjecture), and Borwein, Ferguson & Mossinghoff (2008) showed that the smallest such x is 72185376951205. Spira (1968) showed by numerical calculation that the finite Dirichlet series above for N=19 has a zero with real part greater than 1. Turán also showed that a somewhat weaker assumption, the nonexistence of zeros with real part greater than 1+N−1/2+ε for large N in the finite Dirichlet series above, would also imply the Riemann hypothesis, but Montgomery (1983) showed that for all sufficiently large N these series have zeros with real part greater than 1 + (log log N)/(4 log N). Portanto, Turán's result is vacuously true and cannot help prove the Riemann hypothesis.

Noncommutative geometry Connes (1999, 2000) has described a relationship between the Riemann hypothesis and noncommutative geometry, and showed that a suitable analog of the Selberg trace formula for the action of the idèle class group on the adèle class space would imply the Riemann hypothesis. Some of these ideas are elaborated in Lapidus (2008).

Hilbert spaces of entire functions Louis de Branges (1992) showed that the Riemann hypothesis would follow from a positivity condition on a certain Hilbert space of entire functions. However Conrey & Li (2000) showed that the necessary positivity conditions are not satisfied. Despite this obstacle, de Branges has continued to work on an attempted proof of the Riemann hypothesis along the same lines, but this has not been widely accepted by other mathematicians.[19] Quasicrystals The Riemann hypothesis implies that the zeros of the zeta function form a quasicrystal, a distribution with discrete support whose Fourier transform also has discrete support. Dyson (2009) suggested trying to prove the Riemann hypothesis by classifying, or at least studying, 1-dimensional quasicrystals.

Arithmetic zeta functions of models of elliptic curves over number fields When one goes from geometric dimension one, por exemplo. an algebraic number field, to geometric dimension two, por exemplo. a regular model of an elliptic curve over a number field, the two-dimensional part of the generalized Riemann hypothesis for the arithmetic zeta function of the model deals with the poles of the zeta function. In dimension one the study of the zeta integral in Tate's thesis does not lead to new important information on the Riemann hypothesis. Contrary to this, in dimension two work of Ivan Fesenko on two-dimensional generalisation of Tate's thesis includes an integral representation of a zeta integral closely related to the zeta function. In this new situation, not possible in dimension one, the poles of the zeta function can be studied via the zeta integral and associated adele groups. Related conjecture of Fesenko (2010) on the positivity of the fourth derivative of a boundary function associated to the zeta integral essentially implies the pole part of the generalized Riemann hypothesis. Suzuki (2011) proved that the latter, together with some technical assumptions, implies Fesenko's conjecture.

Multiple zeta functions Deligne's proof of the Riemann hypothesis over finite fields used the zeta functions of product varieties, whose zeros and poles correspond to sums of zeros and poles of the original zeta function, in order to bound the real parts of the zeros of the original zeta function. By analogy, Kurokawa (1992) introduced multiple zeta functions whose zeros and poles correspond to sums of zeros and poles of the Riemann zeta function. To make the series converge he restricted to sums of zeros or poles all with non-negative imaginary part. So far, the known bounds on the zeros and poles of the multiple zeta functions are not strong enough to give useful estimates for the zeros of the Riemann zeta function.

Location of the zeros Number of zeros The functional equation combined with the argument principle implies that the number of zeros of the zeta function with imaginary part between 0 and T is given by {estilo de exibição N(T)={fratura {1}{pi }}mathop {matemática {Arg} } (XI (s))={fratura {1}{pi }}mathop {matemática {Arg} } (Gama ({tfrac {s}{2}})pi^{-{fratura {s}{2}}}zeta (s)s(s-1)/2)} for s=1/2+iT, where the argument is defined by varying it continuously along the line with Im(s)=T, starting with argument 0 at ∞+iT. This is the sum of a large but well understood term {estilo de exibição {fratura {1}{pi }}mathop {matemática {Arg} } (Gama ({tfrac {s}{2}})pi^{-s/2}s(s-1)/2)={fratura {T}{2pi }}registro {fratura {T}{2pi }}-{fratura {T}{2pi }}+7/8+O(1/T)} and a small but rather mysterious term {estilo de exibição S(T)={fratura {1}{pi }}mathop {matemática {Arg} } (zeta (1/2+iT))=O(log T).} So the density of zeros with imaginary part near T is about log(T)/2Pi, and the function S describes the small deviations from this. The function S(t) jumps by 1 at each zero of the zeta function, and for t ≥ 8 it decreases monotonically between zeros with derivative close to −log t.

Trudgian (2014) provou que, E se {displaystyle T>e} , então {estilo de exibição |N(T)-{fratura {T}{2pi }}registro {fratura {T}{2pi e}}|leq 0.112log T+0.278log log T+3.385+{fratura {0.2}{T}}} .

Karatsuba (1996) proved that every interval (T, T+H] por {displaystyle Hgeq T^{{fratura {27}{82}}+varepsilon }} contains at least {estilo de exibição H(log T)^{fratura {1}{3}}e^{-c{quadrado {log log T}}}} points where the function S(t) changes sign.

Selberg (1946) showed that the average moments of even powers of S are given by {estilo de exibição int _{0}^{T}|S(t)|^{2k}dt={fratura {(2k)!}{k!(2pi )^{2k}}}T(log log T)^{k}+O(T(log log T)^{k-1/2}).} This suggests that S(T)/(log log T)1/2 resembles a Gaussian random variable with mean 0 and variance 2π2 (Ghosh (1983) proved this fact). Em particular |S(T)| is usually somewhere around (log log T)1/2, but occasionally much larger. The exact order of growth of S(T) is not known. There has been no unconditional improvement to Riemann's original bound S(T)=O(log T), though the Riemann hypothesis implies the slightly smaller bound S(T)=O(log T/log log T).[8] The true order of magnitude may be somewhat less than this, as random functions with the same distribution as S(T) tend to have growth of order about log(T)1/2. In the other direction it cannot be too small: Selberg (1946) showed that S(T) ≠ o((log T)1/3/(log log T)7/3), and assuming the Riemann hypothesis Montgomery showed that S(T) ≠ o((log T)1/2/(log log T)1/2).

Numerical calculations confirm that S grows very slowly: |S(T)| < 1 for T < 280, |S(T)| < 2 for T < 6800000, and the largest value of |S(T)| found so far is not much larger than 3.[20] Riemann's estimate S(T) = O(log T) implies that the gaps between zeros are bounded, and Littlewood improved this slightly, showing that the gaps between their imaginary parts tends to 0. Theorem of Hadamard and de la Vallée-Poussin Hadamard (1896) and de la Vallée-Poussin (1896) independently proved that no zeros could lie on the line Re(s) = 1. Together with the functional equation and the fact that there are no zeros with real part greater than 1, this showed that all non-trivial zeros must lie in the interior of the critical strip 0 < Re(s) < 1. This was a key step in their first proofs of the prime number theorem. Both the original proofs that the zeta function has no zeros with real part 1 are similar, and depend on showing that if ζ(1+it) vanishes, then ζ(1+2it) is singular, which is not possible. One way of doing this is by using the inequality {displaystyle |zeta (sigma )^{3}zeta (sigma +it)^{4}zeta (sigma +2it)|geq 1} for σ > 1, t real, and looking at the limit as σ → 1. This inequality follows by taking the real part of the log of the Euler product to see that {estilo de exibição |zeta (sigma +it)|=exp Re sum _{p^{n}}{fratura {p^{-n(sigma +it)}}{n}}=exp sum _{p^{n}}{fratura {p^{-Eu sinto Muito }porque(tlog p^{n})}{n}},} where the sum is over all prime powers pn, de modo a {estilo de exibição |zeta (sigma )^{3}zeta (sigma +it)^{4}zeta (sigma +2it)|=exp sum _{p^{n}}p^{-Eu sinto Muito }{fratura {3+4porque(tlog p^{n})+porque(2tlog p^{n})}{n}}} which is at least 1 because all the terms in the sum are positive, due to the inequality {displaystyle 3+4cos(teta )+porque(2teta )=2(1+porque(teta ))^{2}geq 0.} Zero-free regions De la Vallée-Poussin (1899–1900) proved that if σ + i t is a zero of the Riemann zeta function, então 1 − σ ≥ C / registro(t) for some positive constant C. Em outras palavras, zeros cannot be too close to the line σ = 1: there is a zero-free region close to this line. This zero-free region has been enlarged by several authors using methods such as Vinogradov's mean-value theorem. Ford (2002) gave a version with explicit numerical constants: ζ(p + i t ) 0 em qualquer momento |t | ≥ 3 e {displaystyle sigma geq 1-{fratura {1}{57.54(registro {|t|})^{2/3}(registro {registro {|t|}})^{1/3}}}.} Dentro 2015, Mossinghoff and Trudgian proved[21] that zeta has no zeros in the region {displaystyle sigma geq 1-{fratura {1}{5.573412registro |t|}}} por |t| ≥ 2. This is the largest known zero-free region in the critical strip for {displaystyle 3.06cdot 10^{10}<|t|x 5.5cdot 10^{4408}} . Zeros on the critical line Hardy (1914) and Hardy & Littlewood (1921) showed there are infinitely many zeros on the critical line, by considering moments of certain functions related to the zeta function. Selberg (1942) proved that at least a (pequena) positive proportion of zeros lie on the line. Levinson (1974) improved this to one-third of the zeros by relating the zeros of the zeta function to those of its derivative, and Conrey (1989) improved this further to two-fifths. Dentro 2020, this estimate was extended to five-twelfths by Pratt, Robles, Zaharescu and Zeindler[22] by considering extended mollifiers that can accommodate higher order derivatives of the zeta function and their associated Kloosterman sums. Most zeros lie close to the critical line. Mais precisamente, Bohr & Landau (1914) showed that for any positive ε, the number of zeroes with real part at least 1/2+ε and imaginary part at between -T and T is {estilo de exibição O(T)} . Combined with the facts that zeroes on the critical strip are symmetric about the critical line and that the total number of zeroes in the critical strip is {estilo de exibição Theta (Tlog T)} , almost all non-trivial zeroes are within a distance ε of the critical line. Ivić (1985) gives several more precise versions of this result, called zero density estimates, which bound the number of zeros in regions with imaginary part at most T and real part at least 1/2+ε. Hardy–Littlewood conjectures In 1914 Godfrey Harold Hardy proved that {displaystyle zeta left({tfrac {1}{2}}+itright)} has infinitely many real zeros. The next two conjectures of Hardy and John Edensor Littlewood on the distance between real zeros of {displaystyle zeta left({tfrac {1}{2}}+itright)} and on the density of zeros of {displaystyle zeta left({tfrac {1}{2}}+itright)} on the interval {estilo de exibição (T,T+H]} for sufficiently large {displaystyle T>0} , e {displaystyle H=T^{a+varepsilon }} and with as small as possible value of {displaystyle a>0} , Onde {displaystyle varepsilon >0} is an arbitrarily small number, open two new directions in the investigation of the Riemann zeta function: Para qualquer {displaystyle varepsilon >0} there exists a lower bound {estilo de exibição T_{0}=T_{0}(varepsilon )>0} such that for {displaystyle Tgeq T_{0}} e {displaystyle H=T^{{tfrac {1}{4}}+varepsilon }} the interval {estilo de exibição (T,T+H]} contains a zero of odd order of the function {estilo de exibição zeta {De repente (}{tfrac {1}{2}}+it{maior )}} .

Deixar {estilo de exibição N(T)} be the total number of real zeros, e {estilo de exibição N_{0}(T)} be the total number of zeros of odd order of the function {displaystyle ~zeta left({tfrac {1}{2}}+itright)~} lying on the interval {estilo de exibição (0,T]~} .

Para qualquer {displaystyle varepsilon >0} existe {estilo de exibição T_{0}=T_{0}(varepsilon )>0} and some {displaystyle c=c(varepsilon )>0} , such that for {displaystyle Tgeq T_{0}} e {displaystyle H=T^{{tfrac {1}{2}}+varepsilon }} the inequality {estilo de exibição N_{0}(T+H)-N_{0}(T)geq cH} é verdade. Selberg's zeta function conjecture Main article: Selberg's zeta function conjecture Atle Selberg (1942) investigated the problem of Hardy–Littlewood 2 and proved that for any ε > 0 there exists such {estilo de exibição T_{0}=T_{0}(varepsilon )>0} and c = c(e) > 0, such that for {displaystyle Tgeq T_{0}} e {displaystyle H=T^{0.5+varepsilon }} the inequality {estilo de exibição N(T+H)-N(T)geq cHlog T} é verdade. Selberg conjectured that this could be tightened to {displaystyle H=T^{0.5}} . UMA. UMA. Karatsuba (1984uma, 1984b, 1985) proved that for a fixed ε satisfying the condition 0 < ε < 0.001, a sufficiently large T and {displaystyle H=T^{a+varepsilon }} , {displaystyle a={tfrac {27}{82}}={tfrac {1}{3}}-{tfrac {1}{246}}} , the interval (T, T+H) contains at least cH log(T) real zeros of the Riemann zeta function {displaystyle zeta left({tfrac {1}{2}}+itright)} and therefore confirmed the Selberg conjecture. The estimates of Selberg and Karatsuba can not be improved in respect of the order of growth as T → ∞. Karatsuba (1992) proved that an analog of the Selberg conjecture holds for almost all intervals (T, T+H], {displaystyle H=T^{varepsilon }} , where ε is an arbitrarily small fixed positive number. The Karatsuba method permits to investigate zeros of the Riemann zeta function on "supershort" intervals of the critical line, that is, on the intervals (T, T+H], the length H of which grows slower than any, even arbitrarily small degree T. In particular, he proved that for any given numbers ε, {displaystyle varepsilon _{1}} satisfying the conditions {displaystyle 0 0, the partial sums {estilo de exibição M(x)=soma _{nleg x}dentro (n)} (the values of which are positions in a simple random walk) satisfy the bound {estilo de exibição M(x)=O(x^{1/2+varepsilon })} with probability 1. The Riemann hypothesis is equivalent to this bound for the Möbius function μ and the Mertens function M derived in the same way from it. Em outras palavras, the Riemann hypothesis is in some sense equivalent to saying that μ(x) behaves like a random sequence of coin tosses. When μ(x) is nonzero its sign gives the parity of the number of prime factors of x, so informally the Riemann hypothesis says that the parity of the number of prime factors of an integer behaves randomly. Such probabilistic arguments in number theory often give the right answer, but tend to be very hard to make rigorous, and occasionally give the wrong answer for some results, such as Maier's theorem. The calculations in Odlyzko (1987) show that the zeros of the zeta function behave very much like the eigenvalues of a random Hermitian matrix, suggesting that they are the eigenvalues of some self-adjoint operator, which would imply the Riemann hypothesis. All attempts to find such an operator have failed. There are several theorems, such as Goldbach's weak conjecture for sufficiently large odd numbers, that were first proved using the generalized Riemann hypothesis, and later shown to be true unconditionally. This could be considered as weak evidence for the generalized Riemann hypothesis, as several of its "predictions" are true. Lehmer's phenomenon,[25] where two zeros are sometimes very close, is sometimes given as a reason to disbelieve the Riemann hypothesis. But one would expect this to happen occasionally by chance even if the Riemann hypothesis is true, and Odlyzko's calculations suggest that nearby pairs of zeros occur just as often as predicted by Montgomery's conjecture. Patterson (1988) suggests that the most compelling reason for the Riemann hypothesis for most mathematicians is the hope that primes are distributed as regularly as possible.[26] Notes ^ Bombieri (2000). ^ Leonhard Euler. Variae observationes circa series infinitas. Commentarii academiae scientiarum Petropolitanae 9, 1744, pp. 160-188, Teoremas 7 e 8. In Theorem 7 Euler proves the formula in the special case {displaystyle s=1} , and in Theorem 8 he proves it more generally. In the first corollary to his Theorem 7 he notes that {estilo de exibição zeta (1)=log infty } , and makes use of this latter result in his Theorem 19, in order to show that the sum of the inverses of the prime numbers is {displaystyle log log infty } . ^ Ingham (1932), Teorema 30, p. 83; Montgomery & Vaughan (2007), p. 430 ^ Ingham (1932), p. 82. ^ Robin (1984). ^ Lagarias, Jeffrey C. (2002), "An elementary problem equivalent to the Riemann hypothesis", O American Mathematical Monthly, 109 (6): 534-543, arXiv:math/0008177, doi:10.2307/2695443, ISSN 0002-9890, JSTOR 2695443, MR 1908008, S2CID 15884740 ^ Broughan 2017, Corolário 5.35. ^ Saltar para: a b c Titchmarsh (1986). ^ Nicely (1999). ^ Baez-Duarte, Luís (2005). "A general strong Nyman-Beurling criterion for the Riemann hypothesis". Publications de l'Institut Mathématique. Nouvelle Série. 78 (92): 117–125. doi:10.2298/PIM0578117B. S2CID 17406178. ^ Rodgers & Tao (2020). ^ Platt & Trudgian (2021). ^ Ribenboim (1996), p. 320. ^ Radziejewski (2007). ^ Wiles (2000). ^ Connes (1999). ^ Leichtnam (2005). ^ Knauf (1999). ^ Sarnak (2005). ^ Odlyzko (2002). ^ Mossinghoff, Michael J.; Trudgian, Timothy S. (2015). "Nonnegative trigonometric polynomials and a zero-free region for the Riemann zeta-function". J. Teoria dos Números. 157: 329–349. arXiv:1410.3926. doi:10.1016/J.JNT.2015.05.010. S2CID 117968965. ^ Pratt, Kyle; Robles, Nicolas; Zaharescu, Alexandru; Zeindler, Dirk (2020). "More than five-twelfths of the zeros of ζ are on the critical line". Res Math Sci. 7. arXiv:1802.10521. doi:10.1007/s40687-019-0199-8. S2CID 202542332. ^ Weisstein, Eric W., "Riemann Zeta Function Zeros", MathWorld: "ZetaGrid is a distributed computing project attempting to calculate as many zeros as possible. It had reached 1029.9 billion zeros as of Feb. 18, 2005." ^ Edwards (1974). ^ Lehmer (1956). ^ p. 75: "One should probably add to this list the 'Platonic' reason that one expects the natural numbers to be the most perfect idea conceivable, and that this is only compatible with the primes being distributed in the most regular fashion possible..." References There are several nontechnical books on the Riemann hypothesis, such as Derbyshire (2003), Rockmore (2005), Sabbagh (2003uma, 2003b), du Sautoy (2003), and Watkins (2015). The books Edwards (1974), Patterson (1988), Borwein et al. (2008), Mazur & Stein (2015) and Broughan (2017) give mathematical introductions, while Titchmarsh (1986), Ivić (1985) and Karatsuba & Voronin (1992) are advanced monographs.

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Poem about the Riemann hypothesis, sung by John Derbyshire. Borwein, Peter, The Riemann Hypothesis (PDF), arquivado a partir do original (PDF) sobre 2009-03-27 (Slides for a lecture) Conrad, K. (2010), Consequences of the Riemann hypothesis Conrey, J. Brian; Farmer, David W, Equivalences to the Riemann hypothesis, arquivado a partir do original em 2010-03-16 Gourdon, Xavier; Sebah, Pascal (2004), Computation of zeros of the Zeta function (Reviews the GUE hypothesis, provides an extensive bibliography as well). Odlyzko, André, Home page including papers on the zeros of the zeta function and tables of the zeros of the zeta function Odlyzko, André (2002), Zeros of the Riemann zeta function: Conjectures and computations (PDF) Slides of a talk Pegg, Ed (2004), Ten Trillion Zeta Zeros, Math Games website, arquivado a partir do original em 2004-11-02, recuperado 2004-10-20. A discussion of Xavier Gourdon's calculation of the first ten trillion non-trivial zeros Pugh, Glen, Java applet for plotting Z(t), arquivado a partir do original em 2015-06-30, recuperado 2009-03-13 Rubinstein, Michael, algorithm for generating the zeros, arquivado a partir do original em 2007-04-27. du Sautoy, Marco (2006), Prime Numbers Get Hitched, Seed Magazine, arquivado a partir do original em 2017-09-22, recuperado 2006-03-27 Stein, William A., What is Riemann's hypothesis, arquivado a partir do original em 2009-01-04 de Vries, Andreas (2004), The Graph of the Riemann Zeta function ζ(s), a simple animated Java applet. Watkins, Matthew R. (2007-07-18), Proposed proofs of the Riemann Hypothesis Zetagrid (2002) A distributed computing project that attempted to disprove Riemann's hypothesis; closed in November 2005 show vte L-functions in number theory show vte Bernhard Riemann show Authority control Categories: 1859 introductionsAnalytic number theoryBernhard RiemannConjecturesHilbert's problemsHypothesesMillennium Prize ProblemsUnsolved problems in number theoryZeta and L-functions

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