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Step * of Lemma real-matrix-add_wf

∀[a,b:ℕ]. ∀[A,B:ℝ(a × b)].  (A + B ∈ ℝ(a × b))
BY
{ (Unfold `rmatrix` 0 THEN ProveWfLemma) }

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Latex:

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Latex:
\mforall{}[a,b:\mBbbN{}].  \mforall{}[A,B:\mBbbR{}(a  \mtimes{}  b)].    (A  +  B  \mmember{}  \mBbbR{}(a  \mtimes{}  b))


By

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Latex:
(Unfold  `rmatrix`  0  THEN  ProveWfLemma)

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