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Old 10-06-2007   #1
mrt
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Default Proof Question

Hi. I couldn't solve a proof problem, can you help me about this?
the question is:


thanks for any help =)
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Old 10-06-2007   #2
Temperal
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Hint:
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So to prove by contrapositive, we must proof
If or , then .

In logic notation, this is
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