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Step * of Lemma ravg_wf

∀[x,y:ℝ].  (ravg(x;y) ∈ ℝ)
BY
{ ProveWfLemma⋅ }

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Latex:

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Latex:
\mforall{}[x,y:\mBbbR{}].    (ravg(x;y)  \mmember{}  \mBbbR{})


By

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Latex:
ProveWfLemma\mcdot{}

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