(1) (Jz) ~r(z) = ~(Jz)r(z)
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(1) ~(Jz) v r(z) = (Jz) r(z) (De Morgan's law) (2) r(z) v ~(Jz) = (Jz) r(z) (commutative property of disjunction) (3) (r(z) v ~(Jz)) ^ ~(Jz) = ((Jz) r(z)) ^ ~(Jz) (conjunction of both sides with ~(Jz)) (4) r(z) ^ ~(Jz) = ~(Jz) ^ r(z) (commutative property of Show more…
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