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Step * of Lemma simple-comb-1-concat-classrel-weak

∀[Info,B,C:Type]. ∀[f:B ⟶ bag(C)]. ∀[X:EClass(B)]. ∀[es:EO+(Info)]. ∀[e:E]. ∀[v:C].
  (v ∈ f@|X|(e) ⇐⇒ ↓∃b:B. (v ↓∈ f b ∧ b ∈ X(e)))
BY
{ (InstLemma `simple-comb-1-concat-classrel` [] THEN Repeat (ParallelLast')) }

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Latex:

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Latex:
\mforall{}[Info,B,C:Type].  \mforall{}[f:B  {}\mrightarrow{}  bag(C)].  \mforall{}[X:EClass(B)].  \mforall{}[es:EO+(Info)].  \mforall{}[e:E].  \mforall{}[v:C].
    (v  \mmember{}  f@|X|(e)  \mLeftarrow{}{}\mRightarrow{}  \mdownarrow{}\mexists{}b:B.  (v  \mdownarrow{}\mmember{}  f  b  \mwedge{}  b  \mmember{}  X(e)))


By

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Latex:
(InstLemma  `simple-comb-1-concat-classrel`  []  THEN  Repeat  (ParallelLast'))

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