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Informal description: ""

{λ[x0: rat ] .​ λ[y0: rat ] .​ λ[z0: rat ] .​ λ[u0: rat ] .​ λ[l:{(y0) .​ (x0)} .​ lessis ] .​ λ[k:{(u0) .​ (z0)} .​ less ]} .​ <{({(u0) .​ (y0)} .​ pl ) .​ ({(z0) .​ (x0)} .​ pl )} .​ less > .​ {({({(k) .​ (u0) .​ (z0)} .​ satz83 ) .​ ({(l) .​ (y0) .​ (x0)} .​ satz85 ) .​ (z0) .​ (u0) .​ (x0) .​ (y0)} .​ satz99a ) .​ ({(z0) .​ (x0)} .​ pl ) .​ ({(u0) .​ (y0)} .​ pl )} .​ satz82

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