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Given a non -empty set X, let *: P(X) xx...

Given a non -empty set X, let `*: P(X) xx P(X) ->P(X)`be defined as `A *B = (A - B) uu(B - A), AAA , B in P(X)`. Show that the empty set `varphi`is the identity for the operation * and all the elements A of P(A) are invertible with` A^-1`=A

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