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Informal description: ""

{λ[sigma:Set] .​ λ[tau:Set] .​ λ[upsilon:Set] .​ λ[f:Π[x:sigma] .​ tau] .​ λ[g:Π[x:tau] .​ upsilon] .​ λ[sf:{(f) .​ (tau) .​ (sigma)} .​ surjective ] .​ λ[sg:{(g) .​ (upsilon) .​ (tau)} .​ surjective ]} .​ <Π[x:sigma] .​ upsilon> .​ λ[x:sigma] .​ ((x) .​ f) .​ g

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