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Step * of Lemma real-vec-add-com

∀[n:ℕ]. ∀[X,Y:ℝ^n].  req-vec(n;X + Y;Y + X)
BY
{ (RepUR ``req-vec real-vec real-vec-add`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[n:\mBbbN{}].  \mforall{}[X,Y:\mBbbR{}\^{}n].    req-vec(n;X  +  Y;Y  +  X)


By

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Latex:
(RepUR  ``req-vec  real-vec  real-vec-add``  0  THEN  Auto)

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