Similar to ヘルムホルツの定理

Real-root isolation

Sturm's theorem

Sturm–Picone comparison theorem

Strichartz estimate

Bipolar theorem

Hartman–Grobman theorem

Heine–Cantor theorem

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

Poincaré inequality

Mahler's theorem

Symmetry of second derivatives

Laplace principle (large deviations theory)

Riemann–Lebesgue lemma

Rellich–Kondrachov theorem

Physical mathematics

Witten conjecture

Operational calculus