Sphere Embedding
A 4-sphere has Positive Curvature, with
 | (1) |
 | (2) |
 | (3) |
 | (4) |
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|  | (5) |
With the addition of the so-called expansion parameter, this is the Robertson-Walker line element.
- Hafner-Sarnak-McCurley Constant
- Hahn-Banach Theorem
- Hailstone Number
- Hairy Ball Theorem
- Half
- Half-Closed Interval
- Half-Normal Distribution
- Half-Open Interval
- Halley's Irrational Formula
- Halley's Method
- Halley's Rational Formula
- Hall-Janko Group
- Halphen Constant
- Halphen's Transformation
- Halting Problem
- Hamiltonian Circuit
- Hamiltonian Cycle
- Hamiltonian Graph
- Hamiltonian Group
- Hamiltonian Map
- Hamiltonian Path
- Hamiltonian System
- Hamilton's Equations
- Hamilton's Rules
- Hammer-Aitoff Equal-Area Projection