PHI 1101 Lecture 4: Chapter 4 lecture and reading notes
6 Dec 2017
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Introduction: valid argument form: an argument form is said to be valid if and only if no instance of the form has all true premises and a false conclusion. Some common logical concepts; symbolization: negation (~): a proposition operator which converts true propositions into false ones, and false ones into true ones. Fact 1: if proposition a, b are both true, then proposition a & b is also true. Fact 2: if proposition a & b is true, then a) a is true and b) b is true. February come after january (negation) february does not come after january. Great white sharks are vegetarians (negation) great white sharks are not vegetarians. This negation is true: conjunction (&): words such as and", but", however", nevertheless", although" etc , disjunction (v): eitheror". A v b = either a or b: conditional (->): "if then". Or: a v b, ~b, ____, a, example:
