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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[n:({(b) .​ (a)} .​ and ) .​ not ] .​ λ[b1:b]} .​ <(a) .​ not > .​ {(b1) .​ ({(n) .​ ({(b) .​ (a)} .​ ec )} .​ et ) .​ (b) .​ (a)} .​ ece2

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