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Informal description: ""

{λ[x: frac ] .​ λ[y: frac ] .​ λ[z: frac ] .​ λ[e:{(y) .​ (x)} .​ eq ] .​ λ[f:{(z) .​ (y)} .​ eq ]} .​ <{(z) .​ (x)} .​ eq > .​ {(f) .​ (e) .​ (z) .​ (y) .​ (x)} .​ satz39

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