Topological Groupoid
A topological groupoid over 
is a Groupoid 
such that and are Topological Spaces and 
, 
, and multiplication are continuous maps. Here, and are maps from onto 
with 
and 
References
Weinstein, A. ``Groupoids: Unifying Internal and External Symmetry.'' Not. Amer. Math. Soc. 43, 744-752, 1996.
- Harmonic Series
- Harmonic System of Points
- Harmonious Graph
- Harnack's Inequality
- Harnack's Theorems
- Harshad Number
- Hartley Transform
- Hart's Inversor
- Hart's Theorem
- HashLife
- Hasse-Davenport Relation
- Hasse Diagram
- Hasse-Minkowski Theorem
- Hasse Principle
- Hasse's Algorithm
- Hasse's Conjecture
- Hasse's Resolution Modulus Theorem
- Hat
- Haupt-Exponent
- Hausdorff Axioms
- Hausdorff-Besicovitch Dimension
- Hausdorff Dimension
- Hausdorff Measure
- Hausdorff Paradox
- Hausdorff Space