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Step * 1 1 1 of Lemma iproper-length-iff


1. I : Interval
2. i-finite(I)
3. r0 < (right-endpoint(I) - left-endpoint(I))
4. i-finite(I)
⊢ left-endpoint(I) < right-endpoint(I)
BY
{ (nRAdd ⌜left-endpoint(I)⌝ (-2)⋅ THEN Auto) }

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Latex:

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Latex:

1.  I  :  Interval
2.  i-finite(I)
3.  r0  <  (right-endpoint(I)  -  left-endpoint(I))
4.  i-finite(I)
\mvdash{}  left-endpoint(I)  <  right-endpoint(I)


By

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Latex:
(nRAdd  \mkleeneopen{}left-endpoint(I)\mkleeneclose{}  (-2)\mcdot{}  THEN  Auto)

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