Return the union of elements of two sets.
Examples:
A = finiteset(sym(1), sym(2));
B = finiteset(sym(pi), 2);
C = union(A, B)
⇒ C = (sym) {1, 2, π}
D = interval(sym(3), 4);
union(C, D)
⇒ ans = (sym) {1, 2} ∪ [3, 4]
See also: @sym/intersect, @sym/setdiff, @sym/setxor, @sym/unique, @sym/ismember, @sym/finiteset, @sym/interval.
Package: symbolic