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Euler's identity

Arzelà–Ascoli theorem

Apollonius point

Five lemma

Apollonius's theorem

Open mapping theorem (complex analysis)

Carathéodory's theorem (convex hull)

Cauchy's mean value theorem

Schiffler point

Jordan's lemma

Sylvester–Gallai theorem

Stewart's theorem

Analyticity of holomorphic functions

Thales's theorem

Ceva's theorem

De Moivre's formula

Proof that e is irrational

Hadamard three-circle theorem

Oka coherence theorem

Casorati–Weierstrass theorem

Carathéodory's theorem (conformal mapping)

Cauchy's integral formula

Cauchy's integral theorem

Root of unity

Imaginary unit#i raised to the power of i

Annales de Gergonne

P-adic Teichmüller theory