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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.

An associative ring, also called a Hecke ring, which has a technical definition in terms of commensurable subgroups.

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.

A Heronian tetrahedron, also called a perfect tetrahedron, is a (not necessarily regular) tetrahedron whose sides, face areas, and volume are all rational numbers. It ...