## A Concise Introduction to Logic |

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animals antecedent argu arguer argument form argument is valid asserts categorical propositions categorical syllogism cause circle committed components compute conclusion false conditional proof conditional sequence conditional statement Conj conjunction contains contraposition deductive denoted derive the conclusion disjunctive syllogism event example Exercise existential extensional definition F F F F T F fact following arguments formal fallacy hypothesis identical Impl increase indirect proof inductive argument informal fallacies instantiation interpreted invalid letters lexical definition logically equivalent mammals means ment modus ponens necessary condition non-P nuclear obtain obversion occurs percent persons predicate term premises and conclusion probability quantifier rules of inference sample Simp square of opposition standard form substitution instance sufficient condition symbolic theory things tion translated true premises truth table truth value universal Venn diagrams words x)(Ax D Bx