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Informal description: ""

{λ[x: frac ] .​ λ[y: frac ] .​ λ[z: frac ] .​ λ[e:{(y) .​ (x)} .​ eq ] .​ λ[l:{(x) .​ (z)} .​ lessf ]} .​ <{(y) .​ (z)} .​ lessf > .​ {(e) .​ ((z) .​ refeq ) .​ (l) .​ (y) .​ (z) .​ (x) .​ (z)} .​ satz45

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