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Recently Bezerra, Garcia and Stichtenoth constructed an explicit tower F=(Fn)n⩾0 of function fields over a finite field Fq3, whose limit λ(F)=limn→∞N(Fn)/g(Fn) attains the Zink bound λ(F)⩾2(q2−1)/(q+2). Their proof is rather long and very technical. In this paper we replace the complex calculations in their work by structural arguments, thus giving a much simpler and shorter proof for the limit of...
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