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- For differential geometry usage, see glossary of differential geometry and topology.
In geometry, a hypersurface is a generalization of the concept of hyperplane. Suppose an enveloping manifold M has n dimensions; then any submanifold of M of n − 1 dimensions is a hypersurface. Equivalently, the codimension of a hypersurface is one.
In algebraic geometry, a hypersurface in projective space of dimension n is an algebraic set that is purely of dimension n − 1. It is then defined by a single equation F = 0, a homogeneous polynomial in the homogeneous coordinates. It may have singularities, so not in fact be a submanifold in the strict sense. "Primal" is an old term for an irreducible hypersurface.
See also
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