Isohedron
A convex Polyhedron with symmetries acting transitively on its faces. Every isohedron hasan Even number of faces (Grünbaum 1960).
References
Grünbaum, B. ``On Polyhedra in Grünbaum, B. and Shepard, G. C. ``Spherical Tilings with Transitivity Properties.'' In The Geometric Vein: The Coxeter Festschrift (Ed. C. Davis, B. Grünbaum, and F. Shenk). New York: Springer-Verlag, 1982.
Having All Faces Congruent.'' Bull. Research Council Israel 8F, 215-218, 1960.
- Rounding
- Routh-Hurwitz Theorem
- Routh's Theorem
- RSA Encryption
- RSA Number
- Rubber-Sheet Geometry
- Rubik's Clock
- Rubik's Cube
- Rudin-Shapiro Sequence
- Rudvalis Group
- Rule
- Ruled Surface
- Rule of 72
- Ruler
- Ruler Function
- Ruling
- Run
- Runge-Kutta Method
- Runge-Walsh Theorem
- Running Knot
- Russell's Antinomy
- Russell's Paradox
- Russian Multiplication
- Russian Roulette
- Ryser Formula