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Informal description: ""

{λ[a:Prop] .​ λ[ksi:Set] .​ λ[x:ksi] .​ λ[y:ksi] .​ λ[z:ksi]} .​ <Prop> .​ {({({(y) .​ (z) .​ (ksi)} .​ is ) .​ ((a) .​ not )} .​ imp ) .​ ({({(x) .​ (z) .​ (ksi)} .​ is ) .​ (a)} .​ imp )} .​ and

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