Similar to コーシーの平均値定理

Proof that π is irrational

Interesting number paradox

Open mapping theorem (complex analysis)

Rank–nullity theorem

Gauss's lemma (number theory)

Angle bisector theorem

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