# Math Help - hhhellllpp????????

1. ## hhhellllpp????????

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

2. Originally Posted by kodirl
Show that AuB=Bua for any sets A and B.......
I have told you what you can use to prove that in similar your question.

Use Logic rules.

3. Originally Posted by kodirl
Show that AuB=Bua for any sets A and B.......
I recommend to show that,
$(A\cup B)\subseteq (B\cup A)$
$(B\cup A)\subseteq (A\cup B)$
Then,
$A=B$