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Step * of Lemma angle-sum_wf

∀e:EuclideanPlane. ∀a,b,c,x,y,z,i,j,k:Point.  (abc + xyz ≅a ijk ∈ ℙ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}e:EuclideanPlane.  \mforall{}a,b,c,x,y,z,i,j,k:Point.    (abc  +  xyz  \mcong{}\msuba{}  ijk  \mmember{}  \mBbbP{})


By

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Latex:
ProveWfLemma

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