We can apply equivalence rules to parts of lines in a proof as well as to entire lines.
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Q34: The rule of addition indicates that if
Q35: The rule of modus tollens indicates that
Q36: A single line in a proof may
Q37: Hypothetical syllogism is an implicational rule.
Q38: Conjunction is an equivalence rule.
Q40: The rule of commutation applies to conditionals.
Q41: The rule of exportation applies to disjunctions.
Q42: According to De Morgan's laws, ~(p ⋁
Q43: According to contraposition (the equivalence rule), ~A
Q44: The law of excluded middle states that
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