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Informal description: ""

{λ[sigma:Set] .​ λ[p:∀[x:sigma] .​ Prop] .​ λ[n:({(p) .​ (sigma)} .​ some ) .​ not ] .​ λ[s:sigma]} .​ <((s) .​ p) .​ not > .​ (s) .​ {(n) .​ (p) .​ (sigma)} .​ th3

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