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Step * of Lemma singleton_int_seg

∀[a,b:ℤ]. ∀[x,y:{a..b-}].  x = y ∈ {a..b-} supposing b ≤ (a + 1)
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Latex:

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Latex:
\mforall{}[a,b:\mBbbZ{}].  \mforall{}[x,y:\{a..b\msupminus{}\}].    x  =  y  supposing  b  \mleq{}  (a  +  1)


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