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Step * of Lemma r2-lines-par_wf

∀[a,b,c,d:ℝ^2].  (r2-lines-par(a;b;c;d) ∈ ℙ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[a,b,c,d:\mBbbR{}\^{}2].    (r2-lines-par(a;b;c;d)  \mmember{}  \mBbbP{})


By

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Latex:
ProveWfLemma

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