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Informal description: ""

{λ[x0: rat ] .​ λ[y0: rat ] .​ λ[x1: frac ] .​ λ[y1: frac ] .​ λ[x1ix0:{((x0) .​ class ) .​ (x1)} .​ inf ] .​ λ[y1iy0:{((y0) .​ class ) .​ (y1)} .​ inf ] .​ λ[l:{(y0) .​ (x0)} .​ less ]} .​ <{(y1) .​ (x1)} .​ lessf > .​ {(y1iy0) .​ (x1ix0) .​ (y1) .​ (x1) .​ (l) .​ (y0) .​ (x0)} .​ also19

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