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 9?
A) 8, 6 MT B) 8, 6 MP C) 8, 5 MP
B
Philosophy & Belief
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