PHIL 1102 Chapter Notes - Chapter 1: Logical Consequence
Document Summary
"not" and "if: an argument is valid if it is impossible for its premises to be true and its conclusion to be false, analyze validity in steps. Two cases, sentence has "it is not the case" or "if" It is not the case = a negation. Use a tilde to signify a negation. Use capital letters p through z as abbreviations for english sentences. Form conditional, if introduces the antecedent and then introduces the consequent. An arrow symbolizes if, then: only concerned with declarative sentences that can be proved as true or false, formation of a symbolic language using sentence letters, negation symbol, conditional sign, and parentheses, characterizing symbolic sentences. Each initial node of the tree is a sentence letter. Each nonbranching node is of the form having a as its sole immediate ancestor, each branching node is in the form of (p-> q)
