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[n:(b) .​ not ] .​ λ[i:{(b) .​ (a)} .​ imp ]} .​ <(a) .​ not > .​ {(n) .​ (i) .​ ( con ) .​ (b) .​ (a)} .​ trimp

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