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Informal description: ""

{λ[sigma:Set] .​ λ[tau:Set] .​ λ[p1:{(tau) .​ (sigma)} .​ pairtype ]} .​ <{({({(p1) .​ (tau) .​ (sigma)} .​ second ) .​ ({(p1) .​ (tau) .​ (sigma)} .​ first ) .​ (tau) .​ (sigma)} .​ pair ) .​ (p1) .​ ({(tau) .​ (sigma)} .​ pairtype )} .​ is > .​ {({(p1) .​ (tau) .​ (sigma)} .​ pairis1 ) .​ (p1) .​ ({({(p1) .​ (tau) .​ (sigma)} .​ second ) .​ ({(p1) .​ (tau) .​ (sigma)} .​ first ) .​ (tau) .​ (sigma)} .​ pair ) .​ ({(tau) .​ (sigma)} .​ pairtype )} .​ symis

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