PHIL 210 Lecture Notes - Lecture 2: Logical Disjunction, Law Of Excluded Middle, Critical Thinking
8 May 2020
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Law of identity: p if and only if p. Conjunction: a compound statement containing two sub-statements (called conjuncts), joined with the word and", or near- synonyms like as well as". Disjunctive statement: disjunctive statement, or disjunction: a compound statement containing two sub- statements (called disjuncts), joined with the word or", or near-equivalents like. Alternatively": a conjunction is true if and only, a disjunction is true if and only if at least if all of its conjuncts are true. Disjunction ( or") can be understood inclusively or exclusively. Inclusive or": at least one of the listed disjoints is true. (hence the inclusive disjunction one of its disjoints is true. is also true if both its disjoints are true. ) Exclusive or": one and only one of the disjuncts is true. For most purposes, it is best to treat or" inclusively, as far as the meaning of the word itself, and to regard exclusiveness as arising from implicature.
