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Mathematics, 10.07.2021 23:30 antoniomunoz424

∀ x, if P(x) then Q(x) → ∀ a, if ¬P(a) then ¬Q(a). The previous proposition is...?
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fake

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∀ x, if P(x) then Q(x) → ∀ a, if ¬P(a) then ¬Q(a). The previous proposition is...?
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