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1.Set Theory

easy

Assume that $P(A)=P(B) .$ Show that $A=B$.

Solution

Let $P(A)=P(B)$

To show: $A=B$

Let $x \in A$

$A \in P(A)=P(B)$

$\therefore x \in C,$ for some $C \in P(B)$

Now, $C \subset B$

$\therefore x \in B$

$\therefore A \subset B$

Similarly, $B \subset A$

$\therefore A=B$

Std 11

Mathematics

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