Elliptic Geometry
A constant curvature Non-Euclidean Geometry which replaces the Parallel Postulate with the statement ``throughany point in the plane, there exist no lines Parallel to a given line.'' Elliptic geometry is sometimes also calledRiemannian Geometry. It can be visualized as the surface of a Sphere onwhich ``lines'' are taken as Great Circles. In elliptic geometry, the sum of angles of aTriangle is 
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- Symmetry Group
- Symmetry Operation
- Symmetry Principle
- Symplectic Diffeomorphism
- Symplectic Form
- Symplectic Group
- Symplectic Manifold
- Symplectic Map
- Symplectomorphism
- Synclastic
- Synergetics
- Synthesized Beam
- Syntonic Comma
- Syracuse Algorithm
- Syracuse Problem
- System of Differential Equations
- System of Equations
- Syzygies Problem
- Syzygy
- Szilassi Polyhedron
- Szpiro's Conjecture
- Sárközy's Theorem
- T2-Separation Axiom
- Tableau
- Tabu Search