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Informal description: ""

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

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