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Informal description: ""

{λ[sigma:Set] .​ λ[tau:Set] .​ λ[s:sigma] .​ λ[t:tau]} .​ <{({({(t) .​ (s) .​ (tau) .​ (sigma)} .​ pair ) .​ (tau) .​ (sigma)} .​ first ) .​ (s) .​ (sigma)} .​ is > .​ {({(t) .​ (s) .​ (tau) .​ (sigma)} .​ firstis1 ) .​ (s) .​ ({({(t) .​ (s) .​ (tau) .​ (sigma)} .​ pair ) .​ (tau) .​ (sigma)} .​ first ) .​ (sigma)} .​ symis

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