Editing Congruence (section)

==Mathematics==
* [[Congruence (geometry)]], being the same size and shape
* Congruence or [[congruence relation]], in abstract algebra, an equivalence relation on an algebraic structure that is compatible with the structure
* In [[modular arithmetic]], having the same remainder when divided by a specified integer
**[[Ramanujan's congruences]], congruences for the partition function, {{math|''p''(''n'')}}, first discovered by Ramanujan in 1919
**[[Congruence subgroup]], a subgroup defined by congruence conditions on the entries of a matrix group with integer entries
**[[Congruence of squares]], in number theory, a congruence commonly used in integer factorization algorithms
* [[Matrix congruence]], an equivalence relation between two matrices
* [[Congruence (manifolds)]], in the theory of smooth manifolds, the set of integral curves defined by a nonvanishing vector field defined on the manifold
* [[Congruence (general relativity)]], in general relativity, a congruence in a four-dimensional Lorentzian manifold that is interpreted physically as a model of spacetime or a bundle of world lines
* [[Zeller's congruence]], an algorithm to calculate the day of the week for any date
* [[Scissors congruence]], related to Hilbert's third problem