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Step * of Lemma rfun*2_wf

∀[f:ℝ ⟶ ℝ ⟶ ℝ]. ∀[x,y:ℝ*].  (f*(x;y) ∈ ℝ*)
BY
{ ProveWfLemma }

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Latex:

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


By

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Latex:
ProveWfLemma

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