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Step * of Lemma qsub_wf

∀[r,s:ℚ].  (r - s ∈ ℚ)
BY
{ (Unfold `qsub` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[r,s:\mBbbQ{}].    (r  -  s  \mmember{}  \mBbbQ{})


By

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Latex:
(Unfold  `qsub`  0  THEN  Auto)

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