Step * of Lemma assert-fset-null

[T:Type]. ∀[s:fset(T)].  uiff(↑fset-null(s);s {} ∈ fset(T))
BY
Auto }

1
1. Type
2. fset(T)
3. ↑fset-null(s)
⊢ {} ∈ fset(T)

2
1. Type
2. fset(T)
3. {} ∈ fset(T)
⊢ ↑fset-null(s)


Latex:


Latex:
\mforall{}[T:Type].  \mforall{}[s:fset(T)].    uiff(\muparrow{}fset-null(s);s  =  \{\})


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Latex:
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