Similar to ガウス＝クロンロッド求積法

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

Vincent's theorem

Aitken's delta-squared process

Gaussian function

Gaussian curvature

Gauss–Kuzmin–Wirsing operator

Gauss–Seidel method

Gaussian integer

Gaussian integral

Gauss–Newton algorithm

Gaussian elimination

Hypergeometric differential equation

Gauss–Bonnet theorem

Gauss–Markov theorem