Union
From AoPSWiki
The union of several sets is the set which contains all the elements of each of the given sets. The union of sets
and
is denoted
.
For any sets
and
,
and
. It follows that
if and only if
.
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The union of several sets is the set which contains all the elements of each of the given sets. The union of sets
and
is denoted
.
For any sets
and
,
and
. It follows that
if and only if
.

