We use prior knowledge
We make assumptions/ premises we infer from past experiences
We take a premise and then apply it so that a conclusion must follow
Rationalists – those who believe reason is the ideal way to achieve knowledge
vs
Empiricists – those who believe perception is the ideal way to achieve knowledge
Truth – what is the case ie property of statements, must be public, eternal, individual
Justify – we do this using reason, perception, language, authority
Logic – something is either valid or invalid, reason uses logic
Deduction – from a general claim to a specific claim
Induction – from a specific claim to a general claim
Syllogism – takes premise one and premise two and forms a logical conclusion, Rationalists believe they preserve truth but do not create it
Premise one
All dogs are mammals
Premise two
Fido is a dog
Conclusion
Therefore Fido is a mammal
Involving three terms that occur twice, dog, mammal. Fido
Involving a quantifier, all, some
Other examples
All A’s are B’s, Some A’s are C’s, Therefore some B’s are C’s
All A’s are B’s, All B’s are C’s, Therefore all A’s are C’s
All Bobos have dogs, No doctors have dogs, Therefore no Bobos are doctors
Friday, April 3, 2009
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