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Question

Show that for any two sets A and B:

(i)A=(AB)(AB) and
(ii)A(BA)=(AB)

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Solution

(i) To prove A=(AB)(AB)
Let xA
xB or x/B

If xBxAB
If x/BxAB

Hence x(AB)(AB)
A(AB)(AB)

Let y(AB)(AB)
y(AB) (or) y(AB)

[yA and yB] (or) [yA and y/B]
yA

(AB)(AB)A
Hence A=(AB)(AB).

(ii) B=AB
A(BA)AB

Let xABxA or xB
If xA, then xA(BA)

A(BA)=AB
If xA, then xBA

xA(BA)
(AB)A(BA)

AB=A(BA).

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