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Step * of Lemma eu-length_wf

∀[e:EuclideanPlane]. ∀[s:Segment].  (|s| ∈ {p:Point| O_X_p} )
BY
{ (ProveWfLemma THEN InstLemma `eu-extend-property` [⌜e⌝;⌜O⌝;⌜X⌝;⌜s.1⌝;⌜s.2⌝]⋅ THEN Auto) }

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Latex:

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Latex:
\mforall{}[e:EuclideanPlane].  \mforall{}[s:Segment].    (|s|  \mmember{}  \{p:Point|  O\_X\_p\}  )


By

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Latex:
(ProveWfLemma  THEN  InstLemma  `eu-extend-property`  [\mkleeneopen{}e\mkleeneclose{};\mkleeneopen{}O\mkleeneclose{};\mkleeneopen{}X\mkleeneclose{};\mkleeneopen{}s.1\mkleeneclose{};\mkleeneopen{}s.2\mkleeneclose{}]\mcdot{}  THEN  Auto)

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