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For all sets A and B, A - (A nn B) is e...

For all sets A and B, `A - (A nn B)` is equal to `"………"`

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