Similar to 局所連結空間

Interesting number paradox

Open mapping theorem (complex analysis)

Rank–nullity theorem

Gauss's lemma (number theory)

Angle bisector theorem

Carathéodory's theorem (convex hull)

Leibniz formula for determinants

Coupon collector's problem

Casey's theorem

Kőnig's lemma

Tree of primitive Pythagorean triples

Cauchy's mean value theorem

Mean value theorem (divided differences)

Schiffler point

Shannon's source coding theorem

Noisy-channel coding theorem

Jordan's lemma

Sylvester–Gallai theorem

Stewart's theorem

Law of sines

Law of tangents

Analyticity of holomorphic functions

Linear independence

Diagonal lemma

Thales's theorem

Monotone convergence theorem

Ceva's theorem

Intermediate value theorem