Double cover
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Wikipedia : http://en.wikipedia.org/wiki/Double_coverIn mathematics, a double cover or double covering may refer to:

Double cover (topology), a twotoone mapping from one topological space to another. Frequently occurring special cases include
 The orientable double cover of a nonorientable manifold
 The bipartite double cover of an undirected graph G, formed by the graph tensor product G ×K_{2}
 A double covering group of a topological group such as a Lie group, a group extension of index two formed by a topological double cover. A double cover may also be used to refer to nontopological group extensions of index two, for instance extensions of finite groups.
 Cycle double cover, a collection of cycles in a graph that together include each edge twice. The cycle double cover conjecture is the unproven assertion that every bridgeless graph has a cycle double cover.
Double coverage may also refer to:
 Double coverage, a defensive strategy in American football, basketball, and other sports
 Being covered by more than one health insurance plan
 A type of Asphalt roll roofing.
disambiguation page lists mathematics articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article. 
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