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PHIL 110 Lecture Notes - Syllogism

by OneClass254736 , Spring 2011
3 Pages

Course Code
PHIL 110
Linda Rollin

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7 April
Disjunctive syllogisms – either/or
Hypothetical syllogisms – if/then
Simple propositions
My dog is brown
Symbolize = p
My dog is not brown
Symbolize = ~p = “not p”
John doesn’t run fast
Symbolize = “q”
John does run fast
Disjunctive proposition – two simple propositions joined by “or”
Either Fido ran away or Fido got hit by a car
Two simple propositions – disjuncts
Two kinds of or
Inclusive or includes possibility of both being true
Exclusive or excludes it (one or the other)
It will be inclusive or in this class
Take first disjunct – p, second – q
So: p or q
Or = v
p v q

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7 AprilDisjunctive syllogismseitherorHypothetical syllogismsifthenSimple propositionsMy dog is brownSymbolizepOppositedenialcontradictoryMy dog is not brownSymbolizepnot pJohn doesnt run fastSymbolizeqJohn does run fastqDisjunctive propositiontwo simple propositio
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