PHL245H1 Lecture Notes - Lecture 2: Temporal Logic, Implicature, Vagueness
Document Summary
Inductive arguments: even if premises are true, conclusion isn"t guaranteed to be true: deductive arguments: if the premises are true, conclusion is guaranteed to be true. Conclusion is what we are being asked to believe. Deductive arguments preserve truth, get out as much truth you put in. Two part: an argument is valid if theres no logically possible situation in which all of its premises are true and its conclusion false. Valid arguments: can have false premises, can have false conclusions, can"t have true premises and false conclusion. Arguments can have true premises, true conclusion, but be invalid. Trivial validity: arguments with contradictory premises are automatically valid, an argument with a conclusion true by definition is automatically valid. Valid/invalid: arguments are only valid if they restrict the possibility properly, deductive validity needs guarantee of this. Letters: p- z represent sentences: propositions: assert something true/false.
