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This print is a terrible copy from a old library book that tons of subscript are not recognizable. I got two books from Nabu Press they both have the same problems (the other is even worse.) Don't buy any book from it.
This is a short (68 pages),intense and excelent book where are studied the Dirichlet's series ( the results are former to 1915). The author is an eminent mathematician, a great number theorist, G. H. Hardy.
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