Similar to ド・ロンシャン点

Apollonius point

Yff center of congruence

Schiffler point

Circumgon

Encyclopedia of Triangle Centers

Triangle center

Orthocentroidal circle

Annales de Gergonne

P-adic Teichmüller theory

RSA (cryptosystem)

Vieta jumping

Witch of Agnesi

Abelian group

Category of abelian groups

Abelian category

Abelian variety

Abel's theorem

Abel equation

Abel–Jacobi map

Abel–Ruffini theorem

Eisenstein series

Eisenstein integer

Iverson bracket

Einstein tensor

Einstein notation