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D.15.19.5 isElement

Procedure from library sets.lib (see sets_lib).

Usage:
isElement(a,M); M set a def

Return:
bool, 1 if a is an element of M, 0 if not

Example:
 
LIB "sets.lib";
int i=1;
int j=5;
list k =1,2,3,4;
Set M=k;
i;
==> 1
j;
==> 5
M;
==> {4; 3; 2; 1}
==> Set with 4 elements
==> 
isElement(i,M);
==> 1
isElement(j,M);
==> 0