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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[x: frac ] . λ[y: frac ] . λ[z: frac ] . λ[u: frac ] . λ[e:{(y) . (x)} . eq ] . λ[f:{(u) . (z)} . eq ]} . <{({({({(u) . (z) . (y) . (x)} . 2u ) . ({(z) . (y) . (x)} . 2z )} . ts ) . ({((x) . 2x ) . ({(y) . (x)} . 1y )} . ts )} . ts ) . ({({({(u) . (z) . (y) . (x)} . 2u ) . ({(z) . (y) . (x)} . 2z )} . ts ) . ({({(y) . (x)} . 2y ) . ((x) . 1x )} . ts )} . ts )} . is > . {(e) . ({({(u) . (z) . (y) . (x)} . 2u ) . ({(z) . (y) . (x)} . 2z )} . ts ) . ({((x) . 2x ) . ({(y) . (x)} . 1y )} . ts ) . ({({(y) . (x)} . 2y ) . ((x) . 1x )} . ts )} . ists1

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