WCarathéodory's existence theorem
WCauchy–Kowalevski theorem
WFenchel–Moreau theorem
WGaussian integral
WJensen's inequality
WRiemann integral
WPeano existence theorem
WPicard–Lindelöf theorem
WPontryagin duality
WRiemann–Lebesgue lemma
WStirling's approximation
WSturm separation theorem