Double Cosets
Given two subgroups, H and K of a group G, the double coset of H and K in G are sets of the form HgK = {hgk : h an element of H , k an element of K }. These are the left cosets of K and right cosets of H when H=1 and K=1 respectively.
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Famous quotes containing the word double:
“Art has a double face, of expression and illusion, just like science has a double face: the reality of error and the phantom of truth.”
—René Daumal (1908–1944)