Definition:Expansion


 * Topology:
 * Expansion of Topology


 * Number Theory and Arithmetic:
 * Decimal Expansion and, in general, Basis Expansion


 * Algebra:
 * Algebraic Expansion: for example: $\paren {x + y}^2 = x^2 + 2 x y + y^2$


 * Number Theory:
 * Continued Fraction Expansion


 * Set Theory:
 * Finite Expansion


 * Propositional Logic:
 * Propositional Expansion

Also see

 * Definition:Extension
 * Definition:Contraction
 * Definition:Expanded