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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“It is a monstrous thing to force a child to learn Latin or Greek or mathematics on the ground that they are an indispensable gymnastic for the mental powers. It would be monstrous even if it were true.”
—George Bernard Shaw (1856–1950)