SETS
Asked by | 28th Jun, 2008, 12:15: PM
Expert Answer:
For A =B A
B and BA
For AB
Let a be an element in A.
To show: ‘a
B
a A⇒a A
X = BX (given)
a BX
aB or aX if aB then AB
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 BA
B and BA BTo show: ‘a B
a A⇒a AX = BX (given)
BXa
B or aX if aB then AB If a
X and as aA then a A X = BX = Φ using the intersection properties
So a cannot be in X
B A Answered by | 30th Jun, 2008, 10:15: AM
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