The reason I am asking is because I have a set,
say {a, b, c} which its elements are constants, and when I
perform a union on this set with another set that contains the
same elements I will get: {a, b, c, {a, b, c}}. But I expect
the result to be {a, b, c}.
That shouldn't happen. If S = {a, b, c}, then S
\union S = {a, b, c}. Are you accidentally
writing S \union {S}?
If you have S = {{a}, {b}, {c}}, then UNION S =
{a, b, c}.
H
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