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For any two sets A and B prove the follo...

For any two sets A and B prove the following: `A-(A-B)=AnnB`

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`LHS = A - (A - B) = A - (A nn B') , [:' A - B = A nn B']`
`= A nn (A nn B')' = A nn [A' uu (B')'] , [:' (A nn B)' = A' uu B']`
`= A nn (A' uu B) , [:' (A')' = A]`
`= (A nn A') uu (A nn B) = phi uu (A nn B)`
` = A nn B = RHS`
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