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Lecture #5 - Philosophy 12A Lecture#5 In-class mid-term has...

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Philosophy 12A Lecture #5 2/2/10 In-class mid-term has been moved up 1 week (to March 11) English LSL III We use ‘&’ to symbolize a variety of English connectives, including: o and, yet, but, however, moreover there is often more to the meaning of but, nevertheless, still, although, however than merely ‘and’. But, in LSL, the closest we can get to the connectives is & On the other hand, there are fewer English expressions that we will symbolize using ‘v’. Typically, these involve either ‘or’ or ‘either…or’ Unless = v We use to symbolize many different expressions (p q) o If p (antecedent) then q (consequent) (if in a p situation, then you’re also in a q situation) o P implies q o P only if q o Q if p o P is a sufficient condition for q o Q is a necessary condition for p o Q provided p o Q whenever p o P is contingent upon q English LSL V: More on Conditionals and Biconditionals
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