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Problems with Riemann function

  1. Aug 7, 2004 #1
    let be the product R(s)R(s+a) with a a complex or real number..the i would like to know the limit Lim(s tends to e) being e a number so R(e)=0 ¿is there a number a so the limit is non-zero nor infinite?..thanks.
  2. jcsd
  3. Aug 7, 2004 #2


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    It will only potentially be non-zero when [tex]\zeta(s)[/tex] has a pole at e+a. Of course this only happens when e+a=1. This limit will never be infinite, since this lone pole of [tex]\zeta(s)[/tex] is simple.

    I say "potentially" non-zero, because the zero could have order 2 or more, making the limit zero. All known zeros to date have been simple, and it's suspected that they all are.
  4. Aug 8, 2004 #3
    Another question..could be proved that 1/R(s+1/2)=O(R(s)?
  5. Aug 8, 2004 #4


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    You mean [tex]\displaystyle\frac{1}{\zeta(1/2+it)}=O(\zeta(1/2+it))[/tex]? If so, no, since the left side has infinitely many poles.

    Do you mean something else? I'm not sure what values of s you're considering, and the +1/2 makes me think of the critical line, hence my guess to your meaning.
  6. Aug 9, 2004 #5
    thanks again.... the equality 1/R(1/2+it)=O(R(1/2+it) is true?..

    another question let be the Riemann zeta function inside the criticla strip 0<sigma<1 then ..is the product R(a+s)R(s) bounded in the sense exist a and b so a<[R(s+a)R(s)]<b where [x] is the modulus of x [x]=sqrt(x*.x) ?
  7. Aug 9, 2004 #6


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    Absolutely not. [tex]1/\zeta(1/2+it)[/tex] has poles for infinitely many values of t.

    You're going to have to clarify what you mean by sqrt(x*.x).

    There are bounds of the form [tex]\zeta(\sigma+it)=O(|t|^{k})[/tex] for any [tex]\sigma[/tex] fixed.The exponent k depends on [tex]\sigma[/tex]. For example, if [tex]\sigma=1/2[/tex], then [tex]k=1/6[/tex] will work (something slightly smaller than 1/6 is known to be true). If [tex]\sigma >1[/tex] then k=0 will work.
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