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[o:{(c) .​ (b) .​ (a)} .​ or3 ]} .​ <{(a) .​ (c) .​ (b)} .​ or3 > .​ {(λ[x:(b) .​ not ] .​ {(x) .​ (o) .​ (c) .​ (b) .​ (a)} .​ th2 ) .​ ({(a) .​ (c)} .​ or ) .​ (b)} .​ th1

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