Similar to アポロニウス点

Schiffler point

Arzelà–Ascoli theorem

Apollonius's theorem

Taylor circle

Apollonian gasket

Yff center of congruence

Encyclopedia of Triangle Centers

Five lemma

Euler's formula

Carathéodory's theorem (convex hull)

Kempner series

Cauchy's mean value theorem

Sylvester–Gallai theorem

Stewart's theorem

Thales's theorem

Ceva's theorem

Parallelogram law

Annales de Gergonne

P-adic Teichmüller theory

RSA cryptosystem

Vieta jumping

Witch of Agnesi

Abelian group

Category of abelian groups

Abelian category