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In every domain with a binary relation <= :

x<y: <=>x<=y/\x!=y;x>y: <=>xnot <=y;x>=y: <=>xnot <y.

We often write
`a` <= `x` < `b` to denote `x` <= `a` /\ `x` < `b` and similar for all other combinations of
the order predicates.

Author: Wolfgang Schreiner

Last Modification: November 16, 1999