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Informal description: ""

λ[x: nat ] .​ <(λ[u: nat ] .​ {((u) .​ suc ) .​ ((x) .​ suc )} .​ is ) .​ some > .​ {({((x) .​ suc ) .​ ( nat )} .​ refis ) .​ (x) .​ (λ[u: nat ] .​ {((u) .​ suc ) .​ ((x) .​ suc )} .​ is ) .​ ( nat )} .​ somei

Validation parameters: sort hierarchy = "Z2", kernel options = ""