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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[e:{(b) .​ (a)} .​ ec ] .​ λ[i:{(a) .​ (c)} .​ imp ]} .​ <{(b) .​ (c)} .​ ec > .​ {(e) .​ (i) .​ ((b) .​ not ) .​ (a) .​ (c)} .​ trimp

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