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jkim3464 jkim3464
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Consider this proof, (1.) ~ A ⊃ ( I v ~ D) (2.)~A•~I /∴ ~D (3.) ~ A (4.) I v ~ D (5.) ~ I • ~ A (6.) ~ I (7.) ~D What is the justification for line 3?

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Textbook 
How to Think Logically

How to Think Logically


Edition: 2nd
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amandashimkusamandashimkus
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