In mathematics, an equivalence relation is a relation that, loosely speaking, partitions a set so that every element of the set is a member of one and only one cell of the partition. Two elements of the set are considered equivalent (with respect to the equivalence relation) if and only if they are elements of the same cell. The intersection of any two different cells is empty; the union of all the cells equals the original set.
Read more about Equivalence Relation: Notation, Definition, Connections To Other Relations, Well-definedness Under An Equivalence Relation, Fundamental Theorem of Equivalence Relations, Comparing Equivalence Relations, Generating Equivalence Relations, Algebraic Structure, Equivalence Relations and Mathematical Logic, Euclidean Relations
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“When needs and means become abstract in quality, abstraction is also a character of the reciprocal relation of individuals to one another. This abstract character, universality, is the character of being recognized and is the moment which makes concrete, i.e. social, the isolated and abstract needs and their ways and means of satisfaction.”
—Georg Wilhelm Friedrich Hegel (1770–1831)