Similar to 半角正接置換

Newton's theorem (quadrilateral)

Proof that e is irrational

Hardy–Littlewood inequality

Pappus's area theorem

Pappus's hexagon theorem

Banach–Alaoglu theorem

Banach fixed-point theorem

Pythagorean theorem

Lune of Hippocrates

Nyquist–Shannon sampling theorem

Fáry's theorem

Fatou's lemma

Feuerbach's theorem

Bézout's identity

Petr–Douglas–Neumann theorem

Helly's theorem

Poincaré–Bendixson theorem

Power of a point

Memorylessness

Menelaus's theorem

Monge's theorem

Jacobi's formula

Dominated convergence theorem

Laplace expansion

Law of cosines

Law of cotangents

Routh's theorem

Lucas's theorem