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Step * of Lemma eu-cong-angle_wf

∀[e:EuclideanPlane]. ∀[a,b,c,x,y,z:Point].  (abc = xyz ∈ ℙ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[e:EuclideanPlane].  \mforall{}[a,b,c,x,y,z:Point].    (abc  =  xyz  \mmember{}  \mBbbP{})


By

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Latex:
ProveWfLemma

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