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Informal description: ""

{λ[sigma:Set] .​ λ[s0:sigma] .​ λ[t0:sigma]} .​ <{({(t0) .​ (s0) .​ (sigma)} .​ wissel ) .​ (sigma) .​ (sigma)} .​ injective > .​ λ[x:sigma] .​ λ[y:sigma] .​ λ[v:{({(y) .​ (t0) .​ (s0) .​ (sigma)} .​ wb ) .​ ({(x) .​ (t0) .​ (s0) .​ (sigma)} .​ wb ) .​ (sigma)} .​ is ] .​ {(v) .​ (y) .​ (x) .​ (t0) .​ (s0) .​ (sigma)} .​ t28

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