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Informal description: ""

{λ[sigma:Set] .​ λ[tau:Set] .​ λ[f:Π[x:sigma] .​ tau] .​ λ[b:{(f) .​ (tau) .​ (sigma)} .​ bijective ]} .​ <{(f) .​ (tau) .​ (sigma)} .​ injective > .​ {(b) .​ ({(f) .​ (tau) .​ (sigma)} .​ surjective ) .​ ({(f) .​ (tau) .​ (sigma)} .​ injective )} .​ ande1

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