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`A uu B=phi implies A =phi` and `B =phi`

Prove that A sub phi implies A =phi .

{phi} = phi

Prove the A uu B = A for all A implies B =phi

Prove the A sub B

If B={phi} then,

Represents sets A,B,C such the A sube B , A nn C = phi and B nn C != phi by venn diagram and shade the portion representing A uu (B nn C )

A= phi , B= phi then A cup B=………..

If M is any set, then write M uu phi and M nn phi

If M is any set, then write M uu phi and M nn phi