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Informal description: ""

{λ[sigma:Set] .​ λ[tau:Set] .​ λ[f:Π[x:sigma] .​ tau]} .​ <Prop> .​ {(λ[x:sigma] .​ {(λ[y:sigma] .​ {({(y) .​ (x) .​ (sigma)} .​ is ) .​ ({((y) .​ f) .​ ((x) .​ f) .​ (tau)} .​ is )} .​ imp ) .​ (sigma)} .​ all ) .​ (sigma)} .​ all

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