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Im only starting to learn about naive set theory from a book , so pardon me if my answer to the question is really obvious..

Prove that ..

A[tex]\subseteq[/tex]B , if and only if A[tex]\cap[/tex]B =A,if and only if A[tex]\cup[/tex]B=B, if and only if A-B=empty set..

I was thinking of using venn diagrams to visualise it and it makes sense , however I do not know how to go on proving it..

thanks

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# Prooof ?

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