Definition:Congruence
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Congruence may refer to:
- Congruence (Geometry): Two geometric figures are congruent if they are both "the same size and shape".
- Congruence (Metric Spaces): Two subsets of a space are congruent if there is an isometry between them.
- Congruence Modulo an Ideal: A concept in ideal theory.
- Congruence (Number Theory): Two real numbers $x$ and $y$ are congruent (modulo $z \in \R$) iff $x \bmod z = y \bmod z$
- Congruence Relation: An equivalence on an algebraic structure which is compatible with its operation.
