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Step * of Lemma null-bag

∀[T:Type]. ∀[x:bag(T)].  uiff(↑null(x);x = {} ∈ bag(T))
BY
{ (Fold `bag-null` 0 THEN InstLemma `assert-bag-null` [] THEN Trivial) }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}[x:bag(T)].    uiff(\muparrow{}null(x);x  =  \{\})


By

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Latex:
(Fold  `bag-null`  0  THEN  InstLemma  `assert-bag-null`  []  THEN  Trivial)

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