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A right-angled parallelepiped with dimensions a×ab×abc, where a, b, and c are integers.

A database accessed by one or more hash functions.

Two nonsingular forms are equivalent over the rationals iff they have the same determinant and the same p-signatures for all p.

The head of a vector AB^-> is the endpoint B, i.e., the point at which the arrow is placed.

A 100-sided polygon, virtually indistinguishable in appearance from a circle except at very high magnification.

The vertical length of an object from top to bottom.

The boundary of complex hyperbolic 2-space.

Given a Euclidean n-space, H_n=n+1.

A 70-sided polygon.

A property of a space which is also true of each of its subspaces. Being "first-countable" is hereditary, but having a given genus is not.