Isohedral Tiling
Let 
be the group of symmetries which map a Monohedral Tiling 
onto itself. The TransitivityClass of a given tile T is then the collection of all tiles to which T can be mapped by one of the symmetries of . If has 
Transitivity Classes, then is said to be -isohedral. Berglund (1993)gives examples of -isohedral tilings for 
, 2, and 4.
References
Berglund, J. ``Is There a Grünbaum, B. and Shephard, G. C. ``The 81 Types of Isohedral Tilings of the Plane.'' Math. Proc. Cambridge Philos. Soc. 82, 177-196, 1977.-Anisohedral Tile for 
?'' Amer. Math. Monthly 100, 585-588, 1993.
- Extension
- Extension Problem
- Extensions Calculus
- Extent
- Exterior
- Exterior Algebra
- Exterior Angle Bisector
- Exterior Angle Theorem
- Exterior Derivative
- Exterior Dimension
- Exterior Product
- Exterior Snowflake
- Extrapolation
- Extra Strong Lucas Pseudoprime
- Extremal Coloring
- Extremal Graph
- Extremals
- Extreme and Mean Ratio
- Extreme Value Distribution
- Extreme Value Theorem
- Extremum
- Extremum Test
- Extrinsic Curvature
- Fabry Imbedding
- Face