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Proofgold Proof
pf
Let x0 of type
ι
be given.
Assume H0:
SNo
x0
.
Apply SNoLev_prop with
x0
,
ordinal
(
SNoLev
x0
)
leaving 2 subgoals.
The subproof is completed by applying H0.
Assume H1:
ordinal
(
SNoLev
x0
)
.
Assume H2:
SNo_
(
SNoLev
x0
)
x0
.
The subproof is completed by applying H1.
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