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Step * of Lemma real-vec-sub_wf

∀[n:ℕ]. ∀[X,Y:ℝ^n].  (X - Y ∈ ℝ^n)
BY
{ (Unfold `real-vec` 0 THEN ProveWfLemma) }

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Latex:

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Latex:
\mforall{}[n:\mBbbN{}].  \mforall{}[X,Y:\mBbbR{}\^{}n].    (X  -  Y  \mmember{}  \mBbbR{}\^{}n)


By

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Latex:
(Unfold  `real-vec`  0  THEN  ProveWfLemma)

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