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4 - 4/9 ~ not it is not the case that It is not the case...

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4/9 - not, it is not the case that It is not the case that the Sox will win in 2008. ~S – disjunction Either the chair is White or it’s Yellow W V Y  disjunctive statement )  = horseshoe – implication – if…then… If you’re a  t iger then you’re an  a nimal A First part (T) – antecedent  sufficient condition Second part (A) –consequent  necessary condition Being a tiger is a sufficient condition for being an animal, and being an animal  is a  necessary condition for being a tiger. H ilton’s opening  a new hotel is a sufficient condition for  M arriot’s doing so. H  )  M If Hilton opens a new hotel, then so does Marriot. =  -triple bar – biconditional   IF and ONLY IF JFK tightens security if and only if O’Hare does J=O
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JFK tightening security is a necessary and sufficient condition for O’Hare 
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4 - 4/9 ~ not it is not the case that It is not the case...

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