Authors: Choe Ryong Gil
The Riemann hypothesis is well known. The Riemann hypothesis is related with many problems of the analytical number theory. And there have been found some propositions equivalent to one. In particular, the Robin inequality is one of the most famous criterions for the Riemann hypothesis. In this paper we would show one inequality on the sum of divisors function. This inequality is weaker than the Robin inequality, but equivalent to one.
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