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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[sigma:Set] .​ λ[s0:(sigma) .​ set ] .​ λ[t0:(sigma) .​ set ] .​ λ[i:{(t0) .​ (s0) .​ ((sigma) .​ set )} .​ is ]} .​ <{(t0) .​ (s0) .​ (sigma)} .​ incl > .​ λ[x:sigma] .​ λ[y:{(s0) .​ (x) .​ (sigma)} .​ esti ] .​ {(y) .​ (x) .​ (i) .​ (t0) .​ (s0) .​ (sigma)} .​ issete1

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