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Proofgold Proof

pf
Let x0 of type ι be given.
Assume H0: SNo x0.
Claim L1: SNo (SNo_extend1 x0)
Apply SNo_extend1_SNo with x0.
The subproof is completed by applying H0.
Claim L2: SNoLev x0SNoLev (SNo_extend1 x0)
Apply SNo_extend1_SNoLev with x0, λ x1 x2 . SNoLev x0x2 leaving 2 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying ordsuccI2 with SNoLev x0.
Apply SNo_eq with x0, binintersect (SNo_extend1 x0) (SNoElts_ (SNoLev x0)) leaving 4 subgoals.
The subproof is completed by applying H0.
Apply restr_SNo with SNo_extend1 x0, SNoLev x0 leaving 2 subgoals.
The subproof is completed by applying L1.
The subproof is completed by applying L2.
Let x1 of type ιιο be given.
Apply restr_SNoLev with SNo_extend1 x0, SNoLev x0, λ x2 x3 . x1 x3 x2 leaving 2 subgoals.
The subproof is completed by applying L1.
The subproof is completed by applying L2.
Apply SNoEq_sym_ with SNoLev x0, binintersect (SNo_extend1 x0) (SNoElts_ (SNoLev x0)), x0.
Apply SNoEq_tra_ with SNoLev x0, binintersect (SNo_extend1 x0) (SNoElts_ (SNoLev x0)), SNo_extend1 x0, x0 leaving 2 subgoals.
Apply restr_SNoEq with SNo_extend1 x0, SNoLev x0 leaving 2 subgoals.
The subproof is completed by applying L1.
The subproof is completed by applying L2.
Apply SNo_extend1_SNoEq with x0.
The subproof is completed by applying H0.