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The sporadic group HJ, also denoted J_2.

A curve and its polar reciprocal with regard to the fixed conic have the same Halphen transformation.

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

The rules for the multiplication of quaternions.

Objects which are identical except for a mirror reflection are said to display handedness and to be chiral.

The Harary graph H_(k,n) is a particular example of a k-connected graph with n graph vertices having the smallest possible number of edges. The smallest number of edges ...

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

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 connected labeled graph with n graph edges in which all graph vertices can be labeled with distinct integers (mod n) so that the sums of the pairs of numbers at the ends of ...

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