Cover (topology)
In mathematics, a cover of a set X is a collection of sets whose union contains X as a subset. Formally, if
is an indexed family of sets Uα, then C is a cover of X if
Read more about Cover (topology): Cover in Topology, Refinement, Compactness, Covering Dimension
Famous quotes containing the word cover:
“There is reason in the distinction of civil and uncivil. The manners are sometimes so rough a rind that we doubt whether they cover any core or sap-wood at all.”
—Henry David Thoreau (1817–1862)