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Step * of Lemma r2-det_wf

∀[p,q,r:ℝ^2].  (|pqr| ∈ ℝ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[p,q,r:\mBbbR{}\^{}2].    (|pqr|  \mmember{}  \mBbbR{})


By

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Latex:
ProveWfLemma

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