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An element of order 2 in a group (i.e., an element A of a group such that A^2=I, where I is the identity element).

A type of integral named after Henstock and Kurzweil. Every Lebesgue integrable function is HK integrable with the same value.

The integral associated with the Haar measure.

The sporadic group HJ, also denoted J_2.

A system of variables which can be written in the form of Hamilton's equations.

The rules for the multiplication of quaternions.

A polynomial function of the elements of a vector x can be uniquely decomposed into a sum of harmonic polynomials times powers of |x|.

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.