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Step * of Lemma int_seg_subtype

∀[m1,n1,m2,n2:ℤ].  {m1..n1-} ⊆r {m2..n2-} supposing (m2 ≤ m1) ∧ (n1 ≤ n2)
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Latex:

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Latex:
\mforall{}[m1,n1,m2,n2:\mBbbZ{}].    \{m1..n1\msupminus{}\}  \msubseteq{}r  \{m2..n2\msupminus{}\}  supposing  (m2  \mleq{}  m1)  \mwedge{}  (n1  \mleq{}  n2)


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Latex:
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