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Informal description: ""

{λ[x: nat ] .​ λ[y: nat ] .​ λ[n:{(y) .​ (x)} .​ nis ]} .​ <{((y) .​ suc ) .​ ((x) .​ suc )} .​ nis > .​ {(λ[u:{((y) .​ suc ) .​ ((x) .​ suc )} .​ is ] .​ {(u) .​ (n) .​ (y) .​ (x)} .​ t1 ) .​ (n) .​ ({(y) .​ (x)} .​ is ) .​ ({((y) .​ suc ) .​ ((x) .​ suc )} .​ is )} .​ th3

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