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dkwilson dkwilson
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Consider this proof, (1.) (~I ⊃ ~E) • (~E ⊃ E) (2.)~I /∴ I (3.) ~I ⊃ ~E (4.) ~ ~ E ⊃ ~ ~I (5.) E ⊃ I (6.) ~ E (7.) (~E ⊃ E) • (~I ⊃ ~E) (8.) ~E ⊃ E (9.) E (10.) ~ ~ E (11.) ~ ~ I (12.) I What is the justification for line 6?

▸ 4, 5 DS

▸ 5, 2 MT

▸ 3, 4 HS
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How to Think Logically


Edition: 2nd
Authors:
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dongdong
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5, 2 MT

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