In mathematics, an equivalence relation is, loosely, a relation that specifies how to partition a set such that every element of the set is in exactly one of the blocks in the partition, and the union of all the blocks equals the original set. Two elements of the set are considered equivalent (with respect to the equivalence relation) if and only if they are elements of the same block.
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Chimney Liners
Subject: Equivalence relation 
Sun Nov 21, 2010 8:05 am