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Congruence (symbol: ≅) is the state achieved by coming together, the state of agreement. The Latin ''ラテン語:congruō'' meaning “I meet together, I agree”. As an abstract term, congruence means similarity between objects. Congruence, as opposed to approximation, is a relation which implies a species of equivalence. ==Mathematics== * Congruence (geometry), being isometric — roughly, 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, , 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 *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 space time, or a bundle of world lines *Zeller's congruence, an algorithm to calculate the day of the week for any date 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Congruence」の詳細全文を読む スポンサード リンク
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