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D.15.8.3 member

Procedure from library combinat.lib (see combinat_lib).

Usage:
member(e,L); e def, L list

Return:
1 if e is an element of L, 0 otherwise

Theory:
we require the elements involved to have a compare operator ==.

Example:
 
LIB "combinat.lib";
member(1,list(1,4,5));
==> 1