[Logic] Tautologies, Contradictions and Equivalences

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[@jeffreymixonlowe]

There is no video on this upload until 1:40

[@habibhasanshakil9086]

Man your video saved my ass in this semester.
salute you man.

[@specimon]

@8:10 you said "....is only false when the consequent is true and the antecedent is false" referring to ¬q -> p. However it should instead be (the other way round): "Is only false when the consequent is false and the antecedent true" which is the last of the 4 truth table lines I assume?

[@jeffreymixonlowe]

"1:40" ****

[@dominicjohnmutholil]

I have a doubt, doesn't contradiction mean something that doesn't fit well with the information? I learnt that a statement that is always false is called a fallacy. Are they the same thing?