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Informal description: ""

{λ[sigma:Set] .​ λ[tau:Set] .​ λ[f:Π[x:sigma] .​ tau] .​ λ[s:sigma] .​ λ[t:sigma] .​ λ[i:{(t) .​ (s) .​ (sigma)} .​ is ]} .​ <{((t) .​ f) .​ ((s) .​ f) .​ (tau)} .​ is > .​ {(i) .​ ({((s) .​ f) .​ (tau)} .​ refis ) .​ (t) .​ (s) .​ (λ[x:sigma] .​ {((x) .​ f) .​ ((s) .​ f) .​ (tau)} .​ is ) .​ (sigma)} .​ isp

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