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Home Q & A Board Humanities Religion and Philosophy
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blankship blankship
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A year ago
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 4?

▸ 1 Simp

▸ 3, 2 Cond

▸ 3 Simp
Textbook 
How to Think Logically

How to Think Logically


Edition: 2nd
Authors:
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AdieMichelleAdieMichelle
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A year ago
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Correct Slight Smile TY
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