What Is Valid vs. Invalid? | Deductive Reasoning

It can be difficult to recognize what is valid vs. invalid reasoning. Here you'll learn how to identify deductive arguments as valid or invalid—the measure of quality of deductive reasoning.

Deductive validity is a difficult concept. And invalid arguments can _seem_ convincing. So pay careful attention! Deciding whether an argument is valid vs. invalid is an essential skill in logic, critical thinking, philosophy... and everyday life.

Further Reading

Paul Herrick, Introduction to Logic, Chapter 4, “How to Evaluate a Deductive Argument” (Recommended companion textbook for this channel.)

Internet Encyclopedia of Philosophy, "Validity and Soundness"

Mental Floss, "13 Furry Facts about Bobcats"

[jovanna-wq]

Thanks for explaining this! I wish i had found this video earlier.

[ammecovua]

Wow amazing million thanks. I had to watch twice to understand deeply. The first attempt is kind of vague to me

[mamichamuteithia]

excellent video. I still have a question though, when you define validity as it being impossible for the premises to be true and the conclusion false. How exactly are you defining true here? because it can't be in relation to reality.

[vibewbunny]

thank you so much for this simple explanation. i finally get it! appreciate you!

[rlavender]

3:41-5:03-So does this mean that valid arguments/ logic are no guarantee to arriving at truth? You need the claims to be true.

[yqnvnjk]

Is it safe to state "bobcats have short stubby tails" as truth? An opinion is a judgment, viewpoint, or statement that is not conclusive, rather than facts, which are true statements. Maybe, "bobcats have tails" is truth. Please correct me if I am wrong.

[arinirachmatika]

thank you im obligated to write a valid essay

[M._.M_____]

This video made it easier for me to understand thanks you’re a savior 😭🤍