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Informal description: ""

{λ[x1: nat ] .​ λ[x2: nat ] .​ λ[n: nat ] .​ λ[i:{(n) .​ (x1)} .​ is ]} .​ <{({(x2) .​ (n)} .​ fr ) .​ ({(x2) .​ (x1)} .​ fr )} .​ eq > .​ {({(i) .​ (n) .​ (x2) .​ (x1)} .​ isn ) .​ ({(x2) .​ (n)} .​ fr ) .​ ({(x2) .​ (x1)} .​ fr )} .​ refeq1

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