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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.

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

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.

e is transcendental.

A set of statistical distributions having different variances.

(1) Based on or involving trial and error. (2) Convincing without being rigorous.

A 6-polyabolo.

A set of six.