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Step * of Lemma decidable__rat-interval-face

∀I,J:ℚInterval.  Dec(I ≤ J)
BY
{ ((Auto THEN D -1 THEN RepUR ``rat-interval-face`` 0) THEN Auto) }

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Latex:

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Latex:
\mforall{}I,J:\mBbbQ{}Interval.    Dec(I  \mleq{}  J)


By

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Latex:
((Auto  THEN  D  -1  THEN  RepUR  ``rat-interval-face``  0)  THEN  Auto)

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