Cayley's Group Theorem
Every Finite Group of order 
can be represented as a Permutation Group on letters, as first proved byCayley 
in 1878 (Rotman 1995).
References
Rotman, J. J. An Introduction to the Theory of Groups, 4th ed. New York: Springer-Verlag, p. 52, 1995.
- e-Multiperfect Number
- Enantiomer
- Enantiomorph
- Encoding
- Endogenous Variable
- Endomorphism
- Endraß Octic
- Energy
- En-Function
- Engel's Theorem
- Enneacontagon
- Enneacontahedron
- Enneadecagon
- Enneagon
- Enneagonal Number
- Enneakaidecagon
- Enneper's Minimal Surface
- Enneper's Negative Curvature Surfaces
- Enneper-Weierstraß Parameterization
- Enormous Theorem
- Enriques Surfaces
- Entire Function
- Entringer Number
- Entropy
- Entscheidungsproblem