Similar to トレミーの定理

Leibniz formula for determinants

Locally connected space

Coupon collector's problem

Casey's theorem

Kőnig's lemma

Tree of primitive Pythagorean triples

Mean value theorem (divided differences)

Shannon's source coding theorem

Noisy-channel coding theorem

Jordan's lemma

Law of sines

Law of tangents

Analyticity of holomorphic functions

Linear independence

Diagonal lemma

Monotone convergence 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