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Step * of Lemma add_cancel_in_le

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

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


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Latex:
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