Step
*
1
of Lemma
list-powerset_wf
1. T : Type
2. eq : EqDecider(T)
⊢ {{}} ∈ {p:fset(fset(T))| ∀x:fset(T). (x ∈ p
⇐⇒ x ⊆ [])}
BY
{ (MemTypeCD THEN Try (Fold `empty-fset` 0)) }
1
1. T : Type
2. eq : EqDecider(T)
⊢ {{}} ∈ fset(fset(T))
2
1. T : Type
2. eq : EqDecider(T)
⊢ ∀x:fset(T). (x ∈ {{}}
⇐⇒ x ⊆ {})
3
1. T : Type
2. eq : EqDecider(T)
3. p : fset(fset(T))
⊢ istype(∀x:fset(T). (x ∈ p
⇐⇒ x ⊆ {}))
Latex:
Latex:
1. T : Type
2. eq : EqDecider(T)
\mvdash{} \{\{\}\} \mmember{} \{p:fset(fset(T))| \mforall{}x:fset(T). (x \mmember{} p \mLeftarrow{}{}\mRightarrow{} x \msubseteq{} [])\}
By
Latex:
(MemTypeCD THEN Try (Fold `empty-fset` 0))
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