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Proofgold Proof

pf
Let x0 of type ι be given.
Assume H0: x0u6.
Assume H1: In2_lexicographic u5 x0 u5 x0.
Apply H1 with False leaving 2 subgoals.
Assume H2: x0x0.
Apply In_irref with x0.
The subproof is completed by applying H2.
Assume H2: and (x0 = x0) (u5u5).
Apply H2 with False.
Assume H3: x0 = x0.
Assume H4: u5u5.
Apply In_irref with u5.
The subproof is completed by applying H4.