According to the rule of redundancy, we should never repeat any line of a proof.
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Q42: According to De Morgan's laws, ~(p ⋁
Q43: According to contraposition (the equivalence rule), ~A
Q44: The law of excluded middle states that
Q45: According to the law of noncontradiction, ~(p
Q46: The rule of material equivalence is: (p
Q48: The rule of distribution tells us that
Q49: The basic idea behind conditional proof is
Q50: To discharge an assumption is to quit
Q51: If an assumption for a conditional proof
Q52: An indirect proof is a proof that
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