Similar to ピタゴラスの定理

Five lemma

Arzelà–Ascoli theorem

Apollonius point

Apollonius's theorem

Primitive Pythagorean triple

Sylvester–Gallai theorem

Square root of 2

Theorema Egregium

0

1

2

3

4

5

6

7

8

9

Proof that 22/7 exceeds π

Proof that π is irrational

Euler's formula

Interesting number paradox

Open mapping theorem (complex analysis)

Rank–nullity theorem

Gauss's lemma (number theory)

Angle bisector theorem