Similar to アティヤ＝シンガーの指数定理

Askey–Gasper inequality

Askey scheme

Arzelà–Ascoli theorem

Hadamard matrix

Hadamard transform

Ackermann function

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

Chern–Gauss–Bonnet theorem

Generalized Stokes theorem

Enneper surface

Euler's theorem (differential geometry)

Gaussian curvature

Gauss–Bonnet theorem