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A semigroup with a noncommutative product in which no product can ever be expressed more simply in terms of other elements.

A Hermitian inner product space is a complex vector space with a Hermitian inner product.

A product of a reflection in a line and translation along the same line.

An inner product space is a vector space together with an inner product on it. If the inner product defines a complete metric, then the inner product space is called a ...

A doubly nonnegative matrix is a real positive semidefinite n×n square matrix with nonnegative entries. Any doubly nonnegative matrix A of order n can be expressed as a Gram ...

The symbol × used to denote multiplication, i.e., a×b denotes a times b. The symbol × is also used to denote a group direct product, a Cartesian product, or a direct product ...

The graph tensor product, also called the graph cardinal product (Imrich 1998), graph categorical product, graph conjunction, graph direct product (Hammack et al. 2016), ...

The Jordan product of quantities x and y is defined by x·y=1/2(xy+yx).

The commutation operation [a,b]=ab-ba corresponding to the Lie product.

product_(i)dp_idq_i, where p_i and q_i are momenta and positions of particles.