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  2. Ramanujan–Petersson conjecture - Wikipedia

    en.wikipedia.org/wiki/Ramanujan–Petersson...

    The more general Ramanujan–Petersson conjecture for holomorphic cusp forms in the theory of elliptic modular forms for congruence subgroups has a similar formulation, with exponent (k − 1)/2 where k is the weight of the form.

  3. Ramanujan's congruences - Wikipedia

    en.wikipedia.org/wiki/Ramanujan's_congruences

    Extending the results of A. Atkin, Ken Ono in 2000 proved that there are such Ramanujan congruences modulo every integer coprime to 6. For example, his results give For example, his results give p ( 107 4 ⋅ 31 k + 30064597 ) ≡ 0 ( mod 31 ) . {\displaystyle p(107^{4}\cdot 31k+30064597)\equiv 0{\pmod {31}}.}

  4. Ramanujan tau function - Wikipedia

    en.wikipedia.org/wiki/Ramanujan_tau_function

    | τ(p) | ≤ 2p 11/2 for all primes p. The first two properties were proved by Mordell (1917) and the third one, called the Ramanujan conjecture, was proved by Deligne in 1974 as a consequence of his proof of the Weil conjectures (specifically, he deduced it by applying them to a Kuga-Sato variety).

  5. Ramanujan graph - Wikipedia

    en.wikipedia.org/wiki/Ramanujan_graph

    See Winnie Li's survey on Ramanujan's conjecture and other aspects of number theory relevant to these results. [ 5 ] Lubotzky , Phillips and Sarnak [ 2 ] and independently Margulis [ 6 ] showed how to construct an infinite family of ( p + 1 ) {\displaystyle (p+1)} -regular Ramanujan graphs, whenever p {\displaystyle p} is a prime number and p ...

  6. Lafforgue's theorem - Wikipedia

    en.wikipedia.org/wiki/Lafforgue's_theorem

    Lafforgue's theorem implies the Ramanujan–Petersson conjecture that if an automorphic form for GL n (F) has central character of finite order, then the corresponding Hecke eigenvalues at every unramified place have absolute value 1.

  7. Ramanujan's ternary quadratic form - Wikipedia

    en.wikipedia.org/wiki/Ramanujan's_ternary...

    In number theory, a branch of mathematics, Ramanujan's ternary quadratic form is the algebraic expression x 2 + y 2 + 10z 2 with integral values for x, y and z. [ 1 ] [ 2 ] Srinivasa Ramanujan considered this expression in a footnote in a paper [ 3 ] published in 1916 and briefly discussed the representability of integers in this form.

  8. Ford to cut European jobs as EV shift, Chinese rivals take toll

    www.aol.com/news/ford-cut-14-european-jobs...

    Ford said the 4,000 job cuts, which represent around 2.3% of its total workforce of 174,000, would be primarily in Germany and Britain. The U.S. automaker is the latest - after Nissan, Stellantis ...

  9. Mock modular form - Wikipedia

    en.wikipedia.org/wiki/Mock_modular_form

    George Andrews [14] showed that several of Ramanujan's fifth order mock theta functions are equal to quotients ⁠ Θ(𝜏) / θ(𝜏) ⁠ where θ(𝜏) is a modular form of weight ⁠ 1 / 2 ⁠ and Θ(𝜏) is a theta function of an indefinite binary quadratic form, and Dean Hickerson [15] proved similar results for seventh order mock theta ...