Similar to ケンプナー級数

Arzelà–Ascoli theorem

Apollonius point

Eisenstein series

Five lemma

Apollonius's theorem

Euler's formula

Carathéodory's theorem (convex hull)

Cauchy's mean value theorem

Schiffler point

Sylvester–Gallai theorem

Stewart's theorem

Thales's theorem

Monotone convergence theorem

Ceva's theorem

1 + 1 + 1 + 1 + ⋯

1 + 2 + 4 + 8 + ⋯

1 − 1 + 2 − 6 + 24 − 120 + ⋯

1 − 2 + 4 − 8 + ⋯

1/2 + 1/4 + 1/8 + 1/16 + ⋯

1/2 − 1/4 + 1/8 − 1/16 + ⋯

1/4 + 1/16 + 1/64 + 1/256 + ⋯

1 + 2 + 3 + 4 + ⋯

1 − 2 + 3 − 4 + ⋯

Basic hypergeometric series

Small set (combinatorics)

Abel's summation formula