34:26

1.4 Validity, Truth, Soundness, Strength, Cogency

39:25

6.4 Truth Tables for Arguments

30:05

5.3 Rules and Fallacies

10:22

Proving Invalidity (Predicate Calculus)

53:04

7.1 Rules of Implication I

26:02

1.2 Recognizing Arguments

17:53

Extended Arguments

35:04

Common Deductive & Inductive Argument Forms