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Student06 Student06
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2 years ago
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 4?

▸ 3 Cond

▸ 3 DN

▸ 3 Contr
Textbook 
How to Think Logically

How to Think Logically


Edition: 2nd
Authors:
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DPhoenixDPhoenix
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2 years ago
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Student06 Author
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2 years ago
This calls for a celebration Person Raising Both Hands in Celebration
wyq2651
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Yesterday
I appreciate what you did here, answered it right Smiling Face with Open Mouth
shimyshiguy
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2 hours ago
Thank you, thank you, thank you!
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