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Proofgold Proof
pf
Apply nat_ind with
λ x0 .
x0
∈
prim6
0
leaving 2 subgoals.
The subproof is completed by applying UnivOf_In with
0
.
Let x0 of type
ι
be given.
Assume H0:
nat_p
x0
.
Assume H1:
x0
∈
prim6
0
.
Apply ZF_ordsucc_closed with
prim6
0
,
x0
leaving 2 subgoals.
The subproof is completed by applying UnivOf_ZF_closed with
0
.
The subproof is completed by applying H1.
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