Similar to 中心つき多角数

Sums of three cubes

Ages of Three Children puzzle

4-manifold

68–95–99.7 rule

6-j symbol

A* search algorithm

AB5 category

ABC@Home

Abc conjecture

Abramowitz and Stegun

Acta Mathematica

ADF-GLS test

AKS primality test

AMS-LaTeX

Analyse des Infiniment Petits pour l'Intelligence des Lignes Courbes

Annales de Gergonne

Annals of Mathematics

Arg max

Arthur–Merlin protocol

Axiom (computer algebra system)

A¹ homotopy theory

A∞-operad

Ba space

BCH code