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" If "A" is any set,prove that "A sub ph...

" If "A" is any set,prove that "A sub phi hArr A=phi

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Prove that A sub phi rArr A=phi

For any set A, prove that A sube phi hArr A =phi .

Prove that A sub phi implies A =phi .

For any set A,B prove that A cap (B-A)=phi

Prove that : phi- A= phi .

For any two sets A and B, prove that: A nn B=phi rArr A sube 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

For any set A show that A oplus A = phi .

For any set A show that A oplus A = phi .