home	news	documentation	specification		implementation
foreword	milestones	version 2	version 2	(background - core - applications)	library	(static LDDL directory)
citations	visibility	version 1	version 1	(static HELM directory)	helena

Informal description: ""

{λ[a:Prop] .​ λ[b:Prop] .​ λ[c:Prop] .​ λ[i:{(b) .​ (a)} .​ iff ] .​ λ[e:{(c) .​ (a)} .​ ec ]} .​ <{(c) .​ (b)} .​ ec > .​ {({(i) .​ (b) .​ (a)} .​ iffe2 ) .​ (e) .​ (b) .​ (c) .​ (a)} .​ th3

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