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Step * of Lemma add_mono_wrt_le

∀[a,b,n:ℤ].  uiff(a ≤ b;(a + n) ≤ (b + n))
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Latex:

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Latex:
\mforall{}[a,b,n:\mBbbZ{}].    uiff(a  \mleq{}  b;(a  +  n)  \mleq{}  (b  +  n))


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