Hello

LetA, B and C be 3 sets. Prove that:

if x belongs to (A-B)-C then x belongs to A-C using:

a)direct proof.

b)proof by contraposition

thank you

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- December 18th 2008, 06:53 AMqwerty321set proof
Hello

LetA, B and C be 3 sets. Prove that:

if x belongs to (A-B)-C then x belongs to A-C using:

a)direct proof.

b)proof by contraposition

thank you

- December 18th 2008, 07:22 AMIsomorphism
- December 18th 2008, 07:45 AMqwerty321
when you pu the little c above A or B, what do u mean?

and for the contrapositivity how did u pass from x belongs to A^cUC to A^cUBUC?

thank you - December 18th 2008, 07:50 AMIsomorphism