Question
Sat April 19, 2014 By: Iffat Sultana

My question to you is-

         If A and B are two sets such that A union B = A intersection B, then prove that A=B.

Expert Reply
Sun April 20, 2014
A union B equals A intersection B  rightwards double arrow open curly brackets x : x element of A space o r space x element of B close curly brackets equals open curly brackets x : x element of A space a n d space x element of B close curly brackets  rightwards double arrow A equals B space  o r A union B equals A intersection B  rightwards double arrow open curly brackets x : x element of A space o r space x element of B close curly brackets equals open curly brackets x : x element of A space a n d space x element of B close curly brackets  rightwards double arrow A equals B space  o r
 
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