Proving Invalidity

[@manum6437]

This the best lecture on logic I have ever had recently... I expect more of your classes.... Thank you sir...

[@SumantaSarathiSharma]

There are a lot of lectures on this playlist.

[@kuldipdhiman]

Thanks Sir, very well explained.

[@bbkibines3260]

Thank you so much sirji for making such informative video.

[@SumantaSarathiSharma]

Thank you for appreciation and welcome aboard.

[@nayankumar3882]

Can you explain this using truth tables?

[@SumantaSarathiSharma]

Yes. If you construct the truth table for an invalid argument you will find at least a bad line, where all the premises will be true and conclusion false.

[@fahimabarbhuiyabarbhuiya2844]

Tnks sir

[@tayabanasrin711]

Thank you sir...this is very helpful

[@SumantaSarathiSharma]

Welcome 👍🏻

[@PreciousBestSJ]

So, is the argument true or false?

[@SumantaSarathiSharma]

By the convention, which we are using (Copi) an argument is valid or invalid. If there exist a substitution instance that makes all the premises true and conclusion false, the argument is invalid.

[@bbkibines3260]

I appreciate your efforts

[@SumantaSarathiSharma]

🙏🏻🙏🏻🙏🏻

[@santuroyf1699]

Thank you ❤️ sir

[@SumantaSarathiSharma]

👍🏻

[@juliasmagson9172]

Thank you ❣️

[@SumantaSarathiSharma]

Welcome Julias 👍🏻

[@injamamansari5675]

Sir truth tree method video?

[@SumantaSarathiSharma]

ua-cam.com/video/B456sRznbV8/v-deo.html

[@injamamansari5675]

@@SumantaSarathiSharma sir in Hindi me nhi h

[@injamamansari5675]

@@SumantaSarathiSharma sir apka padya huaaa?

[@SumantaSarathiSharma]

Hamare university ke course mein nahi hai

[@injamamansari5675]

@@SumantaSarathiSharma sir give me contact number kuch baat karna h

[@rahilibty4641]

Thank you sir for helping me

[@SumantaSarathiSharma]

welcome

[@aditithakur623]

Sir please teach truth tree

[@SumantaSarathiSharma]

ua-cam.com/video/mIeG4SbEUvM/v-deo.html