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Ass 3 question 2.4

Posted by Mariusvn

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Mariusvn

Ass 3 question 2.4
August 06, 2006 01:21AM

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Does anybody have any ideas how to approach the proof of this question?

A hint from the lecturer would also be helpfull to point us in the right direction

Thanks

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bester

Re: Ass 3 question 2.4
August 08, 2006 08:19AM

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The question requires you to prove a conditional sentence from no premises, so you need to introduce your own "premise"(temporary premise), by assuming the antecedent of the relevant conditional sentence, to be able to apply the rule of conditional introduction.That temporary premise must later be discharged. Examples on how to go about with such problems are given in your prescribed book on page 210-211.

Lecturer COS261-C