Prove That A = (A ∩ B) ∪ (A − B)

Prove That A = (A ∩ B) ∪ (A − B)

Question:

Show that for any sets \( A \) and \( B \),

\[ A=(A\cap B)\cup(A-B) \]

Solution

\[ (A\cap B)\cup(A-B) \] \[ =(A\cap B)\cup(A\cap B’) \] \[ =A\cap(B\cup B’) \] \[ =A\cap U \] \[ =A \]

Hence proved.

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