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Step * of Lemma real-matrix-times_wf

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

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Latex:

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


By

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Latex:
(Unfold  `rmatrix`  0  THEN  ProveWfLemma)

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