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Informal description: ""

{λ[sigma:Set] .​ λ[p:∀[x:sigma] .​ Prop] .​ λ[n:({(p) .​ (sigma)} .​ all ) .​ not ]} .​ <{({(p) .​ (sigma)} .​ non ) .​ (sigma)} .​ some > .​ λ[x:{({(p) .​ (sigma)} .​ non ) .​ (sigma)} .​ none ] .​ {(x) .​ (n) .​ (p) .​ (sigma)} .​ t2

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