Proving $left|sum_{n>x/m} frac{ chi(n)}{ n^{s}} right| leq 2q |s| (m/x)^{sigma}$












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$text{Show}:displaystyleleft|sum_{n>x/m} frac{ chi(n)}{ n^{s}} right| leq 2q |s| left(frac mxright)^{sigma}$ where $s=sigma +it$.




Here is what I tried:



$displaystyleleft|sum_{n>x/m} frac{ chi(n)}{ n^{s}} right| leq left(frac mxright)^{sigma} sum_{n>x/m} left| chi(n) right|$.



I dont know how to get the $2qs$ part. Here, we assume $chi$ is a character $mod q$.










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  • 1




    $sum_{n=N}^infty chi(n) n^{-s} = sum_{n=N}^infty A_chi(n) (n^{-s}-(n+1)^{-s})$ where $A_chi(n) = sum_{m=N}^n chi(m)$
    – reuns
    Nov 23 at 21:19


















1















$text{Show}:displaystyleleft|sum_{n>x/m} frac{ chi(n)}{ n^{s}} right| leq 2q |s| left(frac mxright)^{sigma}$ where $s=sigma +it$.




Here is what I tried:



$displaystyleleft|sum_{n>x/m} frac{ chi(n)}{ n^{s}} right| leq left(frac mxright)^{sigma} sum_{n>x/m} left| chi(n) right|$.



I dont know how to get the $2qs$ part. Here, we assume $chi$ is a character $mod q$.










share|cite|improve this question




















  • 1




    $sum_{n=N}^infty chi(n) n^{-s} = sum_{n=N}^infty A_chi(n) (n^{-s}-(n+1)^{-s})$ where $A_chi(n) = sum_{m=N}^n chi(m)$
    – reuns
    Nov 23 at 21:19
















1












1








1








$text{Show}:displaystyleleft|sum_{n>x/m} frac{ chi(n)}{ n^{s}} right| leq 2q |s| left(frac mxright)^{sigma}$ where $s=sigma +it$.




Here is what I tried:



$displaystyleleft|sum_{n>x/m} frac{ chi(n)}{ n^{s}} right| leq left(frac mxright)^{sigma} sum_{n>x/m} left| chi(n) right|$.



I dont know how to get the $2qs$ part. Here, we assume $chi$ is a character $mod q$.










share|cite|improve this question
















$text{Show}:displaystyleleft|sum_{n>x/m} frac{ chi(n)}{ n^{s}} right| leq 2q |s| left(frac mxright)^{sigma}$ where $s=sigma +it$.




Here is what I tried:



$displaystyleleft|sum_{n>x/m} frac{ chi(n)}{ n^{s}} right| leq left(frac mxright)^{sigma} sum_{n>x/m} left| chi(n) right|$.



I dont know how to get the $2qs$ part. Here, we assume $chi$ is a character $mod q$.







analytic-number-theory






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edited Nov 23 at 21:14









Yadati Kiran

1,702519




1,702519










asked Nov 23 at 20:17









usere5225321

617412




617412








  • 1




    $sum_{n=N}^infty chi(n) n^{-s} = sum_{n=N}^infty A_chi(n) (n^{-s}-(n+1)^{-s})$ where $A_chi(n) = sum_{m=N}^n chi(m)$
    – reuns
    Nov 23 at 21:19
















  • 1




    $sum_{n=N}^infty chi(n) n^{-s} = sum_{n=N}^infty A_chi(n) (n^{-s}-(n+1)^{-s})$ where $A_chi(n) = sum_{m=N}^n chi(m)$
    – reuns
    Nov 23 at 21:19










1




1




$sum_{n=N}^infty chi(n) n^{-s} = sum_{n=N}^infty A_chi(n) (n^{-s}-(n+1)^{-s})$ where $A_chi(n) = sum_{m=N}^n chi(m)$
– reuns
Nov 23 at 21:19






$sum_{n=N}^infty chi(n) n^{-s} = sum_{n=N}^infty A_chi(n) (n^{-s}-(n+1)^{-s})$ where $A_chi(n) = sum_{m=N}^n chi(m)$
– reuns
Nov 23 at 21:19

















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