Similar to ハーディ＝リトルウッドの不等式

Strichartz estimate

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Proof that 22/7 exceeds π

Proof that π is irrational

Interesting number paradox

Open mapping theorem (complex analysis)

Rank–nullity theorem

Gauss's lemma (number theory)

Angle bisector theorem

Geometric mean theorem

Leibniz formula for determinants

Locally connected space

Coupon collector's problem

Casey's theorem

Kőnig's lemma

Primitive Pythagorean triple

Mean value theorem (divided differences)

Shannon's source coding theorem