Definition:Inverse


 * Logic:
 * The inverse of a conditional $p \implies q$ is $\neg p \implies \neg q$


 * Abstract Algebra:
 * Inverse Element
 * Ring Product Inverse


 * Relation Theory:
 * Inverse Relation
 * Inverse Image (also known as Preimage)


 * Mapping Theory:
 * Inverse Mapping
 * Inverse of a Mapping


 * Matrix Algebra:
 * Inverse Matrix


 * Hilbert Spaces:
 * Inverse of a Bounded Linear Transformation