## A handbook of logic |

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### Contents

What is logic? | 1 |

The analysis of propositions | 13 |

Inferences from simple propositions | 33 |

Copyright | |

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### Common terms and phrases

affirmative alternation analytic antecedent antilogism argue argument Aristotle assert axioms called categorical syllogism cats causal class calculus classical logic classical logicians commit the fallacy construct contradictory contraposition deductive system definition disjunctive distributed enthymemes example existential expression f and q F F F F T F f V q figure formal logic formalist formula girls grampuses Hence Id.T illicit minor implies q inductive inference introverts invalid large number law of noncontradiction main column major premise material equivalence mathematics means method middle term Mill's Mill's methods minor negation negative notation number of instances obverse ordinary paradox postulates predicate term principle probability proof propositional calculus prove q is false q is true question relation rule simple sorites statements subject term substitution superaltern Suppose syllogistic symbolic tautology theorem things tion tive truth functions truth table truth values undistributed valid variables Venn diagrams