PHIL 249 Lecture Notes - Lecture 2: Conjoined Twins, Organ Transplantation, False Premise

• School: University of Calgary
• Department: Philosophy
• Course: PHIL 249
• Professor: Ishtiyaque Hussein Haji

Document Summary

Other sentences = premises provide support for the conclusion. 2 central concepts to assessing arguments: validity, soundness. Conclusion follows the premises, if the premises were true. Nothing to do with whether the premises or conclusions are true/false focuses on the relationship between the premises. If all premises are true, its conclusion is true too = deductively valid. Steps to test validity: assume that all premises are true (even if they are not, ask if all the premises are true, is the conclusion true too? a. b. If the answer is no = not valid. If an argument is not valid, then it is not sound. If an argument is valid, but has at least one false premise, then it is not sound. If you answer yes to both 1 & 2 = sound. Peeing: presenting (presenting, explaining, and evaluating arguments. Write the argument down in premise + conclusion form: explaining.