Similar to ヒルツェブルフ・リーマン・ロッホの定理

Hadamard matrix

Hadamard transform

Ackermann function

Atiyah–Singer index theorem

Sieve of Atkin

Apéry's constant

Apéry's theorem

Abel–Plana formula

Apollonius point

Apollonian gasket

Archimedes's cattle problem

Archimedean property

Twin circles

Algorithm

Artin L-function

Artin–Hasse exponential

Wedderburn–Artin theorem

Artinian module

Artinian ring

Artin–Schreier theory

Generalized Riemann hypothesis

Weil cohomology theory

Riemann–Roch theorem for surfaces

Pseudo-Riemannian manifold

Cayley–Bacharach theorem

Cauchy–Riemann equations

Modularity theorem