4.3 Tables for Validity

[@TheyCallMeD]

Thank you! My book/professor unnecessarily complicated this concept, you are waaaaaaay better at explaining this!

[@virkelie2]

Why is a valid argument defined by "if and only if"... ? What not just if"? What is the difference between "if and only if" and "if"?

[@Kej121]

Is it possible for R, T F T F to interchange with S, T T F F?

[@jellologic]

If I understand your question correctly, the answer is yes. Putting TTFF under R and TFTF under S will not change the result.

[@donnavisr12]

hi how about if all the premises are not true but are mixed. so that there is no single row where all the premises are true? is the argument valid or invalid?

[@jellologic]

If there is no counterexample the argument is valid.

[@donnavisr12]

hi thanks alot. your video really helped!

[@donnavisr12]

jellologic you my friend deserve a medal!

[@pettyroosevelt]

So....the answer to the first problem is invalid.