antisymmetric

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From The Free On-line Dictionary of Computing: (http://www.foldoc.org/, Editor Denis Howe)

A relation R is antisymmetric if,

for all x and y, x R y and y R x => x == y.

I.e. no two different elements are mutually related.

Partial orders and total orders are antisymmetric. If R is also symmetric, i.e.

x R y => y R x

then

x R y => x == y

I.e. different elements are not related.

(1995-04-18)

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