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jtfortwengler jtfortwengler
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Consider this proof, (1.) E • [ ~ I • (~ D v I)] /∴ ~ D v F (2.) [ ~ I • (~ D v I)] • E (3.( ~ I • (~ D v I) (4.) ~ I (5.) (~ D v I) • ~ I (6.) ~ D v I (7.) ~ D (8.) ~ D v F What is the justification for line 3?

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Textbook 

How to Think Logically


Edition: 2nd
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dhk72dhk72
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