Mathematics
- Cover (topology), the mathematical concept of a collection of subsets of a set whose union is the whole set
- Cover (algebra), the concept of an algebraic structure that maps onto another structure in structure-preserving fashion
- A pair in the covering relation of a partially ordered set, or the greater element in such a pair
- A covering space, in the theory of Riemann surfaces and topology
- A (universal / double) covering group, a covering space with group structure, common in theoretical physics
- Cover, an equivalent set of constraints in database theory
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