Asked by  | 28th Jun, 2008, 12:15: PM

Expert Answer:

For A =B  AB and BA  
For AB
 Let a be an element in A.

To show: ‘a B

a A⇒a AX = BX (given)

aB or aX if aB then A
If aX and as aA  then a A X = BX  = Φ 

 using the intersection properties

So a cannot be in X

hence AB   
Similarly by the symmetric argument B

Answered by  | 30th Jun, 2008, 10:15: AM

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