Formulas
- Stickelberger's theorem
- Stieltjes constants
- Rogers–Ramanujan identities
- Stiff equation
- Schauder estimates
- Scherk surface
- Stirling's approximation
- Schoenflies problem
- Schwartz topological vector space
- Schwarz lemma
- T-structure
- Stone's representation theorem for Boolean algebras
- Stone space
- Stone–von Neumann theorem
- Straight-line program