Time remaining:
Write a proof sequence for the following assertion. Justify one of the steps in

Mathematics
Tutor: None Selected Time limit: 0 Hours

Apr 11th, 2015

~(a ^ ~b) this is:( ~a v b) this is: a-->b so

a --> b       premise 1

~b            premise 2

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 ~a  is valid argument for "Modus tollens"



May 29th, 2015

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