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johndoris johndoris
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A year ago
Consider this proof, (1.) E • D (2.) ~ (E • D) ≡ O/∴ Ev~O (3.) [~ (E • D) ⊃ O] • [O ⊃ ~ (E • D)] (4.) [O ⊃ ~(E•D)]• [~(E•D) ⊃ O] (5.) O ⊃ ~ (E • D) (6.) ~ ~ (E • D) (7.) ~ O (8.) ~ O v E (9.) E v ~ O What is the justification for line 4?

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Textbook 
How to Think Logically

How to Think Logically


Edition: 2nd
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ssong07ssong07
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A year ago
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johndoris Author
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A year ago
Helped a lot
2ne1_12345
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This helped my grade so much Perfect
mikey3091
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Correct Slight Smile TY
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