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Step * of Lemma eu-perp-in_wf

∀[e:EuclideanPlane]. ∀[x,a,b,c,d:Point].  (Perp-in(x; ab; cd) ∈ ℙ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[e:EuclideanPlane].  \mforall{}[x,a,b,c,d:Point].    (Perp-in(x;  ab;  cd)  \mmember{}  \mBbbP{})


By

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Latex:
ProveWfLemma

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