Similar to 半角正接置換

Hundredth

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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

Carathéodory's theorem (convex hull)

Leibniz formula for determinants

Locally connected space

Coupon collector's problem

Casey's theorem

Kőnig's lemma

Primitive Pythagorean triple