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Informal description: ""

{λ[x: nat ] .​ λ[y: nat ]} .​ <{(x) .​ ({(y) .​ (x)} .​ pl )} .​ more > .​ {({({(y) .​ (x)} .​ pl ) .​ ( nat )} .​ refis ) .​ (y) .​ (λ[u: nat ] .​ {(u) .​ (x) .​ ({(y) .​ (x)} .​ pl )} .​ diffprop ) .​ ( nat )} .​ somei

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