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Step * of Lemma null-class-property

∀[Info,T:Type]. ∀[es:EO+(Info)]. ∀[e:E]. ∀[v:T].  uiff(v ∈ Null(e);False)
BY
{ (At ⌜𝕌'⌝ Auto⋅ THEN RepUR ``classrel null-class`` (-1) THEN BagMemberD (-1)) }

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Latex:

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Latex:
\mforall{}[Info,T:Type].  \mforall{}[es:EO+(Info)].  \mforall{}[e:E].  \mforall{}[v:T].    uiff(v  \mmember{}  Null(e);False)


By

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Latex:
(At  \mkleeneopen{}\mBbbU{}'\mkleeneclose{}  Auto\mcdot{}  THEN  RepUR  ``classrel  null-class``  (-1)  THEN  BagMemberD  (-1))

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