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Informal description: ""

{λ[sigma:Set] .​ λ[s:sigma] .​ λ[t:sigma] .​ λ[u:sigma] .​ λ[n:({(t) .​ (s) .​ (sigma)} .​ is ) .​ not ] .​ λ[i:{(u) .​ (s) .​ (sigma)} .​ is ]} .​ <({(t) .​ (u) .​ (sigma)} .​ is ) .​ not > .​ {(i) .​ (n) .​ (u) .​ (s) .​ (λ[x:sigma] .​ ({(t) .​ (x) .​ (sigma)} .​ is ) .​ not ) .​ (sigma)} .​ isp

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