Adjacency Relation
The Set 
of Edges of a Graph 
, being a set ofunordered pairs of elements of 
, constitutes a Relation on . Formally, an adjacency relation is any Relation which is Irreflexive and Symmetric.
- s-Run
- S-Signature
- SSS Theorem
- Stability
- Stability Matrix
- Stabilization
- Stable Equivalence
- Stable Improper Node
- Stable Node
- Stable Spiral Point
- Stable Star
- Stable Type
- Stack
- Stamp Folding
- Standard Deviation
- Standard Error
- Standardized Moment
- Standardized Score
- Standard Map
- Standard Normal Distribution
- Standard Space
- Standard Tori
- Stanley's Theorem
- Star
- Star Figure