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Informal description: ""

{λ[sigma:Set] .​ λ[s:sigma] .​ λ[t:sigma] .​ λ[u:sigma] .​ λ[i:{(u) .​ (s) .​ (sigma)} .​ is ] .​ λ[j:{(u) .​ (t) .​ (sigma)} .​ is ]} .​ <{(t) .​ (s) .​ (sigma)} .​ is > .​ {({(j) .​ (u) .​ (t) .​ (sigma)} .​ symis ) .​ (i) .​ (t) .​ (u) .​ (s) .​ (sigma)} .​ tris

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