7.6 Indirect Proof

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Professor Thorsby explains the usage of the Indirect proof in Propositional Proofs.
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Thank you for making me understand this lesson! I learned so much from watching these videos in one day than the whole semester my professor has wasted in thinking he did a good job of teaching it to us!

beatricecastaneda
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You're literally saving my philosophy grade.

darrahnichole
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These videos are saving me ... literally saving my bum in my philosophy class!

jennifermierkey
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Thank you Professor for posting these videos. They are extremely helpful in this difficult/fun subject!

annaandres
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I made a good grade on a test, thanks to your videos! You've explained Chapter 7 better than my instructor did.. Thanks so much!

tamlynn
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i know its been very long since you uploaded this but i have a test coming up and i dont get it T_T why is line 5 okay? i thought aip is the logical opposite? ~M is not the opposite of line 4 tho? shouldnt it be another acp? and not aip? could you explain that further? or anyone who is still here T_T

unknown
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do you by any chance gave a vid for proving logical truths? it would probably be after the indirect proof video.

jmofisi
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Can't you just simply simplify step 3 in your last example to get D? Why do you always do commutation before simplifying it? Isn't just an extra step?

natashaoliveira
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I know, I agree. Fortunately, I have fixed the problem and we are up and running again.

PhilosophicalTechne
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Do you do any videos of indirect proofs that include quantifiers?

Dr.Scarffe
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if I have

p -> r
-p

can I deduce r ?


thanks

luchadb
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Doing it the old way is much better actually.

أحمدالدسوقي-تس
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what is a direct proof? i have a text on it at 11am

calebpatt
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Horrible explanations just like the books. How the hell do you get negation M when you started a new AIP??!!??!?!?

anthonygnoix