Variation
The 
-variation is a variation in which the varied path over which an integral is evaluated may end at differenttimes than the correct path, and there may be variation in the coordinates at the endpoints.
The 
-variation is a variation in which the varied path in configuration space terminates at the endpointsrepresenting the system configuration at the same time 
and 
as the correct path; i.e., the varied path alwaysreturns to the same endpoints in configuration space, so
See also Calculus of Variations, Variation of Argument, Variation of Parameters
- Hecke Operator
- Hecke Ring
- Hectogon
- Hedgehog
- Heegaard Diagram
- Heegaard Splitting
- Heegner Number
- Heesch Number
- Heesch's Problem
- Height
- Heilbronn Triangle Problem
- Heine-Borel Theorem
- Heine Hypergeometric Series
- Heisenberg Group
- Heisenberg Space
- Held Group
- Helen of Geometers
- Helicoid
- Helix
- Helly Number
- Helly's Theorem
- Helmholtz Differential Equation
- Helmholtz Differential Equation--Bipolar Coordinates
- Helmholtz Differential Equation--Cartesian Coordinates
- Helmholtz Differential Equation--Circular Cylindrical Coordinates