even permutation

even permutation

noun Mathematics.
a permutation of a set of n elements, x1, x2, … xn, that leaves unchanged the product of all differences of the form (xixj), where i is less than j.


Origin:
1930–35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Even permutation is always a great word to know.
So is subtraction. Does it mean:
the operation or process of finding the difference between two numbers or quantities, denoted by a minus sign (?)
a series of points as in forming a curve or surface, each of which represents a value of a given function, a network of lines connecting points
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