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Step * of Lemma r-ap_wf

∀[I:Interval]. ∀[f:I ⟶ℝ]. ∀[x:ℝ].  f(x) ∈ ℝ supposing x ∈ I
BY
{ (Unfolds ``rfun r-ap`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[I:Interval].  \mforall{}[f:I  {}\mrightarrow{}\mBbbR{}].  \mforall{}[x:\mBbbR{}].    f(x)  \mmember{}  \mBbbR{}  supposing  x  \mmember{}  I


By

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Latex:
(Unfolds  ``rfun  r-ap``  0  THEN  Auto)

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