Show that AuB=Bua for any sets A and B.......

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- Aug 9th 2006, 06:24 AMkodirlhhhellllpp????????
Show that AuB=Bua for any sets A and B.......

- Aug 9th 2006, 06:51 AMOReillyQuote:

Originally Posted by**kodirl**

Use Logic rules. - Aug 9th 2006, 07:51 AMThePerfectHackerQuote:

Originally Posted by**kodirl**

$\displaystyle (A\cup B)\subseteq (B\cup A)$

$\displaystyle (B\cup A)\subseteq (A\cup B)$

Then,

$\displaystyle A=B$