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Markush group
(US, law) Any of the functionally equivalent chemical entities referenced in a Markush claim.
group buying
(business) The practice of purchasing products and services at reduced prices on the condition that a minimum number of buyers would make the purchase.
matrix group
(group theory) Any group of invertible matrices over a specified field, with the group operation of matrix multiplication.
unitary group
(group theory) For given n, the group of n×n unitary matrices, with the group operation of matrix multiplication.
linear group
(group theory) Any group that is isomorphic to a matrix group.
stem group
(phylogenetics) A paraphyletic group consisting of an ancestor and all its descendants, excluding the living representatives of a collection of species.
symplectic group
(linear algebra, group theory) For given field F and positive integer n, the group of 2n×2n symplectic matrices with elements in F.
group marriages
plural of group marriage
group action
(group theory) A mapping of a mathematical group to the permutations of an object that is compatible with the group operation.