PHILOS 2CT3 Lecture 9: Lecture 9 – Reasoning and Argument continued part III
4 Mar 2018
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Lecture 9 reasoning and argument continued part iii. Consistency a set of claims can all be true at the same time. E. g. this hospital"s policy on hygiene is consistent with our current knowledge of the harmful effects of bacteria. Contradiction two claims are inconsistent or have opposite truth values; when one is false the other is true and vice versa. Though members of the school"s chess team don"t, all members of this school adhere to a strict code of conduct. There is no alien life in the universe, but there must be some aliens out there. Equivalence two claims having the same truth value, if one claim is true and is equivalent to another, the other must be true too. I have a perfect record of attendance" is equivalent to i was present every. I will invite neither jack nor jamaal" is equivalent to both jack and jamaal. Monday when class took place" will not be invited".
