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kristen299 kristen299
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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 12?

▸ 11 Add

▸ 10, 8 MP

▸ 11 DN
Textbook 

How to Think Logically


Edition: 2nd
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richardbuggrichardbugg
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11 DN

1

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