
ord_proper_subset(+Set1, +Set2)

   Checks whether Set1 is a proper subset of Set2

Arguments
   Set1                A set
   Set2                A set

Type
   library(ordset)

Description
	Succeeds when every element of the ordered set Set1 appears
	in the ordered set Set2, and Set2 has at least on element that
	does not occur in Set1.
    

Modes and Determinism
   ord_proper_subset(+, +) is semidet

See Also
   ord_subset / 2, ord_compare / 3
