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Informal description: ""

{λ[a:Prop] .​ λ[b:Prop] .​ λ[c:Prop] .​ λ[i:{(b) .​ (a)} .​ iff ] .​ λ[j:{(c) .​ (b)} .​ iff ]} .​ <{(c) .​ (a)} .​ iff > .​ {({({(i) .​ (b) .​ (a)} .​ iffe2 ) .​ ({(j) .​ (c) .​ (b)} .​ iffe2 ) .​ (a) .​ (b) .​ (c)} .​ trimp ) .​ ({({(j) .​ (c) .​ (b)} .​ iffe1 ) .​ ({(i) .​ (b) .​ (a)} .​ iffe1 ) .​ (c) .​ (b) .​ (a)} .​ trimp ) .​ (c) .​ (a)} .​ iffi

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