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Step * of Lemma rv-sub_wf

∀[rv:RealVectorSpace]. ∀[x,y:Point].  (x - y ∈ Point)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[rv:RealVectorSpace].  \mforall{}[x,y:Point].    (x  -  y  \mmember{}  Point)


By

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Latex:
ProveWfLemma

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