Suslin's Theorem
A Set in a Polish Space is a Borel Set Iff it is both Analytic andCoanalytic. For subsets of 
, a set is 
Iff it is ``hyperarithmetic.''
- Schisma
- Schlegel Graph
- Schläfli Double Six
- Schläfli Function
- Schläfli Integral
- Schläfli Polynomial
- Schläfli's Formula
- Schläfli's Modular Form
- Schläfli Symbol
- Schlömilch's Function
- Schlömilch's Series
- Schmitt-Conway Biprism
- Schnirelmann Constant
- Schnirelmann Density
- Schnirelmann's Theorem
- Schoenemann's Theorem
- Scholz Conjecture
- Schoolgirl Problem
- Schoute Coaxal System
- Schoute's Theorem
- Schrage's Algorithm
- Schroeder Stairs
- Schröder-Bernstein Theorem
- Schröder Number
- Schröder's Equation