Proof Question - XP Math - Forums

 XP Math - Forums Proof Question

 10-06-2007 #1 mrt Guest   Posts: n/a Proof Question Hi. I couldn't solve a proof problem, can you help me about this? the question is: thanks for any help =)
 10-06-2007 #2 Temperal Guest   Posts: n/a Hint: Show more: So to prove by contrapositive, we must proof If $x\le 1$ or $x\ge -1$, then $|x|\le 1$. In logic notation, this is $x\le 1 \text{ xor } x\ge -1 \subset |x|\le 1$

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