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Informal description: ""

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

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