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Step * 1 1 of Lemma list-powerset_wf


1. T : Type
2. eq : EqDecider(T)
⊢ {{}} ∈ fset(fset(T))
BY
{ Auto }

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Latex:

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Latex:

1.  T  :  Type
2.  eq  :  EqDecider(T)
\mvdash{}  \{\{\}\}  \mmember{}  fset(fset(T))


By

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Latex:
Auto

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