Lecture: Unit 4 Derivations in SL Part 1

2:10 Modus Ponens
2:54 Modus Tollens
3:27 Two Fallacies
4:42 Double Negation
5:08 Repetition/Examples
11:43 Four Components of a Proof
11:58 Three Justification Types
20:26 Available Lines
21:38 Completion
21:58 Abbreviations
26:09 3 Derivation Types and Examples
41:56 Mixed Derivations
42:30 Breaking Down Show Lines
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