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[ksi:Set] .​ λ[x:ksi] .​ λ[y:ksi] .​ λ[n:(a) .​ not ]} .​ <{({(y) .​ (y) .​ (ksi)} .​ is ) .​ ((a) .​ not )} .​ imp > .​ λ[x1:(a) .​ not ] .​ {(y) .​ (ksi)} .​ refis

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