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Lecture #6 - Philosophy 12A Lecture#6 English LSL If but...

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Philosophy 12A Lecture #6 2/4/10 English LSL If, but only if, they have made no commitment to the contrary, may reporters reveal their sources, but they always make a commitment and they ought to respect it. Atomic sentences: o Reporters make a commitment to protect their sources C o Reporters may reveal their sources S o Reporters need to respect the commitment to protect their sources. R If, but only if, it is not the case that C, then S, but C and R. o S iff not C, but C and R. (S  ~C) & (C&R) Example 3 Sara is going unless either Richard or Pam is going, and Sara is not going if, and only if, neither Pam nor Quincy are going. o Sara is going S o Richard is going R o Pam is going P o Quincy is going Q S unless R or P, and not S iff neither P nor Q S unless (R v P), and ~S iff (~P & ~Q) (S v (R v P)) & (~S  (~P & ~Q)) Symbolizing/Reconstructing Entire English Arguments Arguments different than sentence in isolation More structure than an individual sentence
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