Improper Integrals: Solving for Integrability of log^a(x)/x^p

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SUMMARY

The discussion focuses on determining the values of p for which the function f(x) = log^a(x)/x^p is integrable over the interval (1, ∞). Participants suggest using the comparison theorem for improper integrals, noting that the function is integrable from (1, N) for any N > 1. The key challenge is to find the limit of the integral as N approaches infinity and identify the conditions on p that ensure this limit exists.

PREREQUISITES
  • Understanding of improper integrals and their convergence criteria.
  • Familiarity with the comparison theorem for integrals.
  • Knowledge of logarithmic functions and their properties.
  • Basic calculus skills, particularly in evaluating limits.
NEXT STEPS
  • Research the comparison theorem for improper integrals in detail.
  • Study the behavior of log^a(x) as x approaches infinity.
  • Learn techniques for evaluating limits of integrals, particularly as N approaches infinity.
  • Explore specific cases of p and their impact on the integrability of f(x).
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Students and educators in calculus, particularly those studying improper integrals, as well as mathematicians interested in the properties of logarithmic functions and their integrability.

economist1985
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Homework Statement



For what p is f(x)=log^a(x)/x^p integrable from (1,infinity)?


Homework Equations



The Attempt at a Solution



I'm not sure, maybe I can do some sort of inequality so that I can arrive at the comparison theorem for improper integrals.
 
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It's always integrable from (1,N) for N > 1. Find an expression for that integral, and then try letting [itex]N \rightarrow \infty[/itex]. For what [itex]p[/itex] does the limit exist?
 

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