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Informal description: ""

{λ[x: nat ] .​ λ[y: nat ] .​ λ[z: nat ] .​ λ[l:{(y) .​ (x)} .​ less ] .​ λ[k:{(z) .​ (y)} .​ less ]} .​ <{(z) .​ (x)} .​ less > .​ {(k) .​ (l) .​ (z) .​ (y) .​ (x)} .​ satz15

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