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D.14.8.2 union
Procedure from librarysets.lib (see sets_lib).
- Usage:
- union(N,M) or N+M; N,M sets
- Return:
- Set, the union of the sets N and M
LIB "sets.lib";
list l =1,2,3;
list j =2,3,4;
Set N=l;
Set M=j;
N;
==> {3; 2; 1}
==> Set with 3 elements
==>
M;
==> {4; 3; 2}
==> Set with 3 elements
==>
N+M;
==> {1; 4; 3; 2}
==> Set with 4 elements
==>
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