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Informal description: ""

{λ[y: nat ] .​ λ[l:{(y) .​ ( 1 )} .​ less ] .​ λ[f:Π[t:( 1 ) .​ 1to ] .​ (y) .​ 1to ] .​ λ[i:{({(f) .​ (l) .​ (y)} .​ yy ) .​ ({(f) .​ (l) .​ (y)} .​ 1y ) .​ ((y) .​ 1to )} .​ is ]} .​ <{(y) .​ ( 1 )} .​ is > .​ {(i) .​ ((y) .​ lessisi3 ) .​ (y) .​ ((y) .​ satz24a ) .​ ( 1 ) .​ (y)} .​ isoutne

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