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blankship blankship
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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 4?

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Textbook 
How to Think Logically

How to Think Logically


Edition: 2nd
Authors:
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AdieMichelleAdieMichelle
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blankship
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Natalie Price
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I appreciate what you did here, answered it right Smiling Face with Open Mouth
nsak
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Thanks for your help!!
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