PHIL 100W Lecture : Conditional sentences.docx

• School: Simon Fraser University
• Department: Philosophy
• Course: PHIL 100W
• Professor: Dc Mc

Document Summary

A conditional is true if the truth of its antecedent is sufficient for. It is possible for an argument of this. Conditional sentences: if p then q a valid argument. If antecedent, then consequent. the truth of its consequent. If all premises are true then its conclusion must also be true. True conditional, the truth of the consequent is necessary for the truth of the antecedent. Affirming the antecedent and denying the consequent are both valid. form to have all true premises and a false conclusion. Ex: dr mc is taller than 10m, then she is taller than 1m. It is true if and only if at least one of its disjuncts is true. Biconditional sentence: p if and only if q. P if and only if q = biconditional. States that p is both necessary and sufficient for q. And that q is both necessary and sufficient for p.