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Proofgold Proof
pf
Let x0 of type
ι
be given.
Let x1 of type
ι
be given.
Apply PowerEq with
x0
,
x1
,
x1
∈
prim4
x0
⟶
x1
⊆
x0
.
Assume H0:
x1
∈
prim4
x0
⟶
x1
⊆
x0
.
Assume H1:
x1
⊆
x0
⟶
x1
∈
prim4
x0
.
The subproof is completed by applying H0.
■