---

Step * of Lemma es-first_wf

∀[es:EO]. ∀[e:es-base-E(es)].  (first(e) ∈ 𝔹)
BY
{ (InstLemma `es-eq-E-wf-base` []
   THEN ParallelLast
   THEN (InstLemma `es-pred-wf-base` [⌈es⌉]⋅ THENA Auto)
   THEN ProveWfLemma) }

---

Latex:


\mforall{}[es:EO].  \mforall{}[e:es-base-E(es)].    (first(e)  \mmember{}  \mBbbB{})


By

(InstLemma  `es-eq-E-wf-base`  []
  THEN  ParallelLast
  THEN  (InstLemma  `es-pred-wf-base`  [\mkleeneopen{}es\mkleeneclose{}]\mcdot{}  THENA  Auto)
  THEN  ProveWfLemma)

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