Throughout this book r and n, and certain other letters, are integer variables. Without exception r is restricted to the positive integers. Unless it is stated to the contrary, the same is true of n and other integer variables. However, on some occasions n and other integer variables will be allowed to have negative and zero values. On such occasions it will be stated explicitly that this is the case.
KeywordsPositive Integer Nonnegative Integer Zeta Function Modular Form Binary Operation
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