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May 13th, 2017, 11:20 AM  #1 
Newbie Joined: Dec 2016 From: Morocco Posts: 2 Thanks: 0  Help With sequences and series.
Forgive me if this is the wrong section for this, but I study maths in French. This is about sequences and series; to be more precise, it is about finding their nature, which is either divergent or convergent, by using different methods (Cauchy, D'Alembert, Reiman...). I study maths in French, so some things might not make sense since they are directly translated by me, but after all maths is one language. I want to determine whether this sequence is convergent or divergent: Un= Last edited by skipjack; May 13th, 2017 at 09:27 PM. 
May 23rd, 2017, 03:45 AM  #2  
Math Team Joined: Jan 2015 From: Alabama Posts: 2,492 Thanks: 632  Quote:
 
May 24th, 2017, 03:28 AM  #3 
Newbie Joined: May 2017 From: south korea Posts: 7 Thanks: 0 
if you have a hard time to understand County Boy's suggestion, then consider few things 1. second parenthesis is collection of terms in a form of i x^(na) * y ^(a1) when a is from 1 to n 2. general expression T(a) = x^na * y^(a1) suffice certain conditions in the cases x^(n1) < T(a) < y^(n1) 3. so second term is within n* x^(n1) and n* y^(n1) Last edited by akuraangran; May 24th, 2017 at 03:31 AM. 

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