Gauss's Mean-Value Theorem
Let 
be an Analytic Function in 
. Then
for
.- Stellation
- Stem-and-Leaf Diagram
- Step
- Step Function
- Step Polynomial
- Steradian
- Stereogram
- Stereographic Projection
- Stereology
- Stern-Brocot Tree
- Stevedore's Knot
- Stewart's Theorem
- Stickelberger Relation
- Stick Number
- Stiefel Manifold
- Stiefel-Whitney Class
- Stiefel-Whitney Number
- Stieltjes Constants
- Stieltjes Integral
- Stieltjes' Theorem
- Stieltjes-Wigert Polynomial
- Stirling Cycle Number
- Stirling Number of the First Kind
- Stirling Number of the Second Kind
- Stirling's Approximation