Methods for assigning values to infinite constructs (ex. sums, products)












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(This question is more to get an overhead view of the topic rather than a well defined answer)



How can one assign values to infinite constructs AND justify them.



What do i mean with infinite constructs, well things like infinite sums or products as well as things like $sqrt{10+sqrt{10+sqrt{10+cdots}}}$ and functions like the R Riemann zeta function.



For sums there is a lot of ways I know of such as the limit of partial sums, Cesàro summation, etc.



but in general if you have something like



$z = f_1(a_1,f_2(a_2,f_3(cdots$



how would you justify that z is the 'correct' value.



(for example when are arguments like due to analitical continuation, convergence appropriate)










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    1












    $begingroup$


    (This question is more to get an overhead view of the topic rather than a well defined answer)



    How can one assign values to infinite constructs AND justify them.



    What do i mean with infinite constructs, well things like infinite sums or products as well as things like $sqrt{10+sqrt{10+sqrt{10+cdots}}}$ and functions like the R Riemann zeta function.



    For sums there is a lot of ways I know of such as the limit of partial sums, Cesàro summation, etc.



    but in general if you have something like



    $z = f_1(a_1,f_2(a_2,f_3(cdots$



    how would you justify that z is the 'correct' value.



    (for example when are arguments like due to analitical continuation, convergence appropriate)










    share|cite|improve this question









    $endgroup$















      1












      1








      1


      1



      $begingroup$


      (This question is more to get an overhead view of the topic rather than a well defined answer)



      How can one assign values to infinite constructs AND justify them.



      What do i mean with infinite constructs, well things like infinite sums or products as well as things like $sqrt{10+sqrt{10+sqrt{10+cdots}}}$ and functions like the R Riemann zeta function.



      For sums there is a lot of ways I know of such as the limit of partial sums, Cesàro summation, etc.



      but in general if you have something like



      $z = f_1(a_1,f_2(a_2,f_3(cdots$



      how would you justify that z is the 'correct' value.



      (for example when are arguments like due to analitical continuation, convergence appropriate)










      share|cite|improve this question









      $endgroup$




      (This question is more to get an overhead view of the topic rather than a well defined answer)



      How can one assign values to infinite constructs AND justify them.



      What do i mean with infinite constructs, well things like infinite sums or products as well as things like $sqrt{10+sqrt{10+sqrt{10+cdots}}}$ and functions like the R Riemann zeta function.



      For sums there is a lot of ways I know of such as the limit of partial sums, Cesàro summation, etc.



      but in general if you have something like



      $z = f_1(a_1,f_2(a_2,f_3(cdots$



      how would you justify that z is the 'correct' value.



      (for example when are arguments like due to analitical continuation, convergence appropriate)







      sequences-and-series infinite-product






      share|cite|improve this question













      share|cite|improve this question











      share|cite|improve this question




      share|cite|improve this question










      asked Jan 10 at 15:13









      Sam CoutteauSam Coutteau

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