4.4 Conversion, Obversion, and Contraposition

[@swirle13isme]

Ok, so wrap up: Conversion - only works on E and I statements, switch Subject and Predicate terms No S are P. --> No P are S. Some S are P. --> Some P are S. Obversion - works on ALL statements, change the quality (e.g. "all," "no") and replace the Predicate with it's compliment ("non-X") All S are P. --> No S are non-P. Some S are P. --> Some S are non-P. Contraposition - only works on A and O statements, switch Subject and Predicate terms, and replace BOTH with their compliment. All S are P. --> All non-P are non-S. No S are non-P. --> No P are non-S.

[@blackfriday1000]

+swirle13isme thanks for clarifying!!! that really help

[@frankduan9989]

Btw, “some” and ”all” are quantifiers rather than qualifiers. It just happen to be that to change the quality of A statement, “all” needs transform to “no”. “All... are not...” is a bit odd.

[@alanfernandobravopimentel1434]

Hero.

[@hana_fa]

Thank you for helping me and my friend on our test! You're an amazing professor. Don't stop making videos :)

[@RomelleSpychala]

Thanks so much for your videos! I'm away from my class (out on 3 weeks surgery leave) and you helped me keep up with my lessons. I couldn't have done it without you! Great teaching.. thanks.

[@mcallisterwilliams]

Your videos are SUPER helpful. I am taking a Philosophy class online, and you have helped decipher Hurley's text tremendously. THANK YOU!!!

[@bananacreamchip]

Your review in the beginning really clicked everything about this topic. Thanks!!

[@MegRickman]

Super helpful! Our teacher in college doesn’t even attempt to teach this to us. We have to learn in on our own. Your videos are key to my understanding as I have dyscalculia and the book and words are difficult to comprehend

[@meghnasingh970]

Idk how to say thanks to you sir! You are my saviour , I thought I wouldn't be able to understand it

[@jalisaross7351]

Thank you so much for these videos. We are following this book and you helping me get through this class. I appriciate it! Many thank yous!

[@elghunk]

All thanks for this video are expressions of gratitude. Now I will try to contraobvert this into a contradictory posision. Seriously, Very helpful video for the average person trying to grasp some logic!

[@kendineiyibakece]

Thank you for this great video. İt's very useful. Greetings from Turkey

[@mariagodinez2868]

You help me understand my logic course so much more! Thanks! Appreciate the videos. So clear and simple:)

[@agreewme]

This was awesome and so helpful. Thank you so much! I'm taking an online logic course (if you can believe that) and I'm so lost most of the time. You made it a lot more understandable for me. Thanks again!

[@abigailperks2099]

I have a test tomorrow and this helped me get a better understanding ‘cause, being in 7th grade My mind will wander! So thank you for this helpful lecture!

[@muhammedcamran4914]

you are learning this stuff in 7th grade?

[@astridvig729]

Hi! Thank you so MUCH! This is the first video I saw and it's so easy to understand what conversion, obversion and contraposition means and in what cases they must be used. Thanks for the information and I'm gonna see your channel. :D

[@cosmosojoto8242]

so clear and understandably and all your online lectures are interesting keep up

[@arushi823]

These videos are such a huge help. Thank you!! I feel like I am gonna ace it. Yay :)

[@dalvishyu1]

thank you so much for your help! my professor talks so fast n hard to understand...this helps me getting through the semester!!!

[@noobbsaiboot]

thank you soo much...you just thought me a week's work in 30mins

[@sanamir9886]

amazing video. It was very helpful

[@Charinaki]

I learned a lot from this video more than from my professor. Thank you so much sir for explaining every step to get full contraposition. :)

[@kb3831]

my instructor links your videos for an extra explanation, thanks :)

[@brightbIade]

Thanks so much for this sir. Really helped me a lot

[@moniqued.katiyasebayang360]

Very helpful, thanks!

[@aileenfowler3967]

Thank you help me a bit.

[@Toxinthecity]

Thank you for your help!

[@daisyrazo7525]

So helpful! Watching thus before my exam lol

[@apeth09]

Sir, I have a query about conversion, obversion and contraposition. I recently gave a class test about it and I was given the statement "No good acts were left unrewarded" and I had to apply all the three operations. At last in contraposition I got "All good acts were rewarded" but I was marked wrong. The teacher informed me that I can't remove the "un-" from "unrewarded". But "All good acts were rewarded" is logically equivalent to "No good acts were left unrewarded" so how am I wrong? Please reply as soon as possible because I'll have to take it up with my teacher. Thanks

[@muhammadidress5315]

thank you so much 💕💕

[@heinhtetsoe5668]

I wonder why we use compliment here not complement...

[@parushiruhil]

but what's the difference between non and not? #obversion

[@ivahknefriteirdeleon7580]

THANK YOU SIR!! :D

[@aileenfowler3967]

i just need more examples, but thank you.

[@dagimabebe3166]

I have learned a lot.but informal fallacy makes me confusing.i have some homeworks so would you mind help me?

[@priyankamalhotra3409]

Thanks a lot :)

[@scarlet2001]

i just wanted to ask why there is No Inversion lesson? because in our lesson there are 4 which is obviously Inversion is the fourth one. I really need it for study! Thnkyou ! :D

[@AdilParray]

What software or hardware tool do you use in making these notes?

[@simplydana1018]

ur awesome

[@frankduan9989]

I feel so bad for the disconnection of screen...

[@marlonelson8479]

Does he have anything of definitions?

[@xiaodongwang7753]

“When you fill, there’s nothing there.” I got a hard time here, comprehending the Venn diagram.

[@riteshtheunknown]

whats the name of text book used in video

[@honeyclover5038]

A Concise Introduction To Logic by Patrick J. Hurley

[@abdulselamabdurahman1875]

it was better if you do the exercises. thanks

[@Zen-lz1hc]

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