Using Boolean algebra logic I am asked to prove

In mathematical analysis course that looks like plain and simple modus tollens principle, but using Boolean algebra logic I just don't know...

Maybe you can help me? :)

Thanks in advance.

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- Apr 4th 2011, 07:34 AMPranasProof of the subset equality (using Boolean algebra logic)
Using Boolean algebra logic I am asked to prove

In mathematical analysis course that looks like plain and simple modus tollens principle, but using Boolean algebra logic I just don't know...

Maybe you can help me? :)

Thanks in advance. - Apr 4th 2011, 08:02 AMPlato