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A pseudoprime is a composite number that passes a test or sequence of tests that fail for most composite numbers. Unfortunately, some authors drop the "composite" ...

A group of five elements, also called a quintuple or pentad.

A quadratic field Q(sqrt(D)) with D>0.

A relation R on a set S is reflexive provided that xRx for every x in S.

A reflexive relation.

An open connected set is called a region (sometimes also called a domain).

The value at a stationary point.

A vector field is a section of its tangent bundle, meaning that to every point x in a manifold M, a vector X(x) in T_xM is associated, where T_x is the tangent space.

An alternative spelling of the name "Chebyshev."

One of the 14 4-polyaboloes.