Series with divergence: Quick easy question

  • Thread starter Thread starter MitsuShai
  • Start date Start date
  • Tags Tags
    Divergence Series
Join the discussion
Ask a follow-up here, or get your own question answered by working scientists, mathematicians and engineers — people, not an autocomplete.
Real named experts · corrections over time · the nuance an AI answer skips
4 replies · 2K views
MitsuShai
Messages
159
Reaction score
0

Homework Statement



http://i324.photobucket.com/albums/k327/ProtoGirlEXE/q8.jpg

Attempt to the solution:
ok I got that it only converges on (1,infinity) because I solved it and q>1 is where it only converges, so for the rest it diverges.
But I'm having trouble with putting the divergency in interval notation because some people where saying it was divergent on (1, infinity) and I typed that in and got it wrong

and I typed in [0,1] on accident and without thinking

but now I'm thinking it's divergent from (-infinity, 1], am I right?
 
Last edited by a moderator:
Physics news on Phys.org
hunt_mat said:
Have you tried to use the integral test? You integrate:
[tex] \int\frac{dx}{x(\ln x)^{q}}[/tex]

yeah u=lnx du=1/x
= u^(-q+1)= (ln x)^(1-q)/(1-q)
 
hunt_mat said:
Have you tried to use the integral test? You integrate:
[tex] \int\frac{dx}{x(\ln x)^{q}}[/tex]


Could you explain why I have to do the integral test to find what integral it diverges?
 
nevermind my answer was right.