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Step * of Lemma eq_int_eq_false_intro

∀[i,j:ℤ].  (i =z j) ~ ff supposing ¬(i = j ∈ ℤ)
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Latex:
\mforall{}[i,j:\mBbbZ{}].    (i  =\msubz{}  j)  \msim{}  ff  supposing  \mneg{}(i  =  j)


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