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Informal description: ""

{λ[sigma:Set] .​ λ[s0:(sigma) .​ set ] .​ λ[t0:(sigma) .​ set ] .​ λ[n:({(t0) .​ (s0) .​ ((sigma) .​ set )} .​ is ) .​ not ] .​ λ[m:({(λ[x:sigma] .​ {(x) .​ (t0) .​ (s0) .​ (sigma)} .​ nissetprop ) .​ (sigma)} .​ some ) .​ not ]} .​ <{(λ[x:sigma] .​ {(x) .​ (s0) .​ (t0) .​ (sigma)} .​ nissetprop ) .​ (sigma)} .​ some > .​ {(λ[y:{(λ[x:sigma] .​ {(x) .​ (s0) .​ (t0) .​ (sigma)} .​ nissetprop ) .​ (sigma)} .​ none ] .​ {(y) .​ (m) .​ (n) .​ (t0) .​ (s0) .​ (sigma)} .​ t4 ) .​ (n) .​ ({(t0) .​ (s0) .​ ((sigma) .​ set )} .​ is ) .​ ({(λ[x:sigma] .​ {(x) .​ (s0) .​ (t0) .​ (sigma)} .​ nissetprop ) .​ (sigma)} .​ none )} .​ th3

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