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Proofgold Proof

pf
Let x0 of type ι be given.
Assume H0: nat_p x0.
Assume H1: 1 ∈ x0.
Assume H2: ordinal (Sing x0).
Apply H2 with False.
Assume H3: TransSet (Sing x0).
Assume H4: ∀ x1 . x1 ∈ Sing x0 ⟶ TransSet x1.
Apply not_TransSet_Sing_tagn with x0 leaving 3 subgoals.
The subproof is completed by applying H0.
The subproof is completed by applying H1.
The subproof is completed by applying H3.
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