Similar to リーマン・ルベーグの補題

Pappus's centroid theorem

Babuška–Lax–Milgram theorem

Picard–Lindelöf theorem

Fenchel's duality theorem

Fenchel–Moreau theorem

Budan's theorem

Helly's selection theorem

Helmholtz decomposition

Poincaré inequality

Mahler's theorem

Symmetry of second derivatives

Rellich–Kondrachov theorem

Lemma (mathematics)

Ogden's lemma

Open and closed maps

Gauss's lemma (number theory)

Shadowing lemma

Kőnig's lemma

Zig-zag lemma

Pumping lemma for regular languages

Diagonal lemma

Zorn's lemma

Teichmüller–Tukey lemma

Nakayama's lemma

Neyman–Pearson lemma