Similar to クリロフ＝ボゴリューボフの定理

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

Gauss–Kuzmin–Wirsing operator

Krein–Milman theorem

Kempner function

Root test

Sicherman dice

Stolz–Cesàro theorem

Schwartz space

Annals of Mathematics

Axiom (computer algebra system)

Courant–Friedrichs–Lewy condition