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Step * of Lemma dist_wf

∀[g:EuclideanPlaneStructure]. ∀[a,b,c,d,e,f:Point].  (D(a;b;c;d;e;f) ∈ ℙ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[g:EuclideanPlaneStructure].  \mforall{}[a,b,c,d,e,f:Point].    (D(a;b;c;d;e;f)  \mmember{}  \mBbbP{})


By

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Latex:
ProveWfLemma

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