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PhoenixFire
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Need help with a proof
The theory is: if 3 divides a^2 then 3 divides a.
Now, they ask for the contrapositive (p>q = ~p>~q), which will be: if 3 does not divide a then 3 does not divide a^2
So now how do you prove the contrapositive:
I'm not sure whether to use proof by cases, direct proof, or any of the other methods of proof.
 one year ago
 one year ago
PhoenixFire Group Title
Need help with a proof The theory is: if 3 divides a^2 then 3 divides a. Now, they ask for the contrapositive (p>q = ~p>~q), which will be: if 3 does not divide a then 3 does not divide a^2 So now how do you prove the contrapositive: I'm not sure whether to use proof by cases, direct proof, or any of the other methods of proof.
 one year ago
 one year ago

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vf321 Group TitleBest ResponseYou've already chosen the best response.0
Well I don't see what's wrong with proving the original statement and by modus tollens show that the contrapositive is true...
 one year ago

vf321 Group TitleBest ResponseYou've already chosen the best response.0
If I was to prove anything here I would use variables and show how they factor...
 one year ago
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