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Two sets/Union/Definition
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Union
For sets
L
{\displaystyle {}L}
und
M
{\displaystyle {}M}
, we call
L
∪
M
=
{
x
∣
x
∈
L
or
x
∈
M
}
{\displaystyle {}L\cup M={\left\{x\mid x\in L{\text{ or }}x\in M\right\}}\,}
the
union
of the sets.