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Informal description: ""

{λ[x: nat ] .​ λ[y: nat ] .​ λ[m:{(x) .​ (y)} .​ more ] .​ λ[u: nat ] .​ λ[du:{(u) .​ (x) .​ (y)} .​ diffprop ]} .​ <{({( 1 ) .​ (x)} .​ pl ) .​ (y)} .​ moreis > .​ {({(du) .​ (u) .​ (m) .​ (y) .​ (x)} .​ t1 ) .​ ({(du) .​ ({(u) .​ (x)} .​ pl ) .​ (y) .​ ( nat )} .​ symis ) .​ ({( 1 ) .​ (x)} .​ pl ) .​ (y) .​ ({(u) .​ (x)} .​ pl )} .​ ismoreis1

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