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Informal description: ""

{λ[x0: rat ] .​ λ[y0: rat ] .​ λ[z0: rat ] .​ λ[l:{(y0) .​ (x0)} .​ lessis ] .​ λ[k:{(z0) .​ (y0)} .​ lessis ]} .​ <{(z0) .​ (x0)} .​ lessis > .​ {(k) .​ (l) .​ (z0) .​ (y0) .​ (x0)} .​ satz88

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