Aibė: Skirtumas tarp puslapio versijų

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:*''A''&nbsp;&nbsp;<math>\subset </math>&nbsp;&nbsp;''A''&nbsp;∪&nbsp;''B''
:*''A''&nbsp;∪&nbsp;''A''&nbsp;&nbsp;&nbsp;=&nbsp;&nbsp;''A''
:*''A''&ntuiti
:*''A''&nbsp;∪&nbsp;ø&nbsp;&nbsp;&nbsp;=&nbsp;&nbsp;''A''
 
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