The rule of modus tollens indicates that if we have a conditional and then denial of its antecedent, we may validly infer the denial of its consequent.
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Q30: A proof is a series of steps
Q31: Implicational rules of inference may, within truth-functional
Q32: The rule of conjunction indicates that if
Q33: The rule of modus ponens indicates that
Q34: The rule of addition indicates that if
Q36: A single line in a proof may
Q37: Hypothetical syllogism is an implicational rule.
Q38: Conjunction is an equivalence rule.
Q39: We can apply equivalence rules to parts
Q40: The rule of commutation applies to conditionals.
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