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Step * of Lemma req-int

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∀[a,b:ℤ].  uiff(r(a) = r(b);a = b ∈ ℤ)
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1. a : ℤ
2. b : ℤ
3. r(a) = r(b)
⊢ a = b ∈ ℤ

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\mforall{}[a,b:\mBbbZ{}].    uiff(r(a)  =  r(b);a  =  b)


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