Similar to ニュートンの定理

Thales's theorem

Monotone convergence theorem

Ceva's theorem

Intermediate value theorem

Parallelogram law

Taylor's theorem

Dirichlet integral

Thébault's theorem

De Moivre's formula

Sz.-Nagy's dilation theorem

Seven circles theorem

Napkin ring problem

Lazy caterer's sequence

Proof that e is irrational

Hardy–Littlewood inequality

Pappus's area theorem

Pappus's hexagon theorem

Banach–Alaoglu theorem

Banach fixed-point theorem

Tangent half-angle substitution

Pythagorean theorem

Nyquist–Shannon sampling theorem

Fatou's lemma

Bézout's identity

Petr–Douglas–Neumann theorem

Helly's theorem

Poincaré–Bendixson theorem

Power of a point