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Informal description: ""

{λ[a:Prop] .​ λ[b:Prop] .​ λ[i:{((a) .​ not ) .​ ((b) .​ not )} .​ imp ]} .​ <{(b) .​ (a)} .​ imp > .​ λ[x:a] .​ {(i) .​ ({(x) .​ (a)} .​ weli ) .​ ((a) .​ not ) .​ (b)} .​ th7

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