What Happens When Evaluating Improper Integrals with Limit?

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SUMMARY

The discussion focuses on evaluating improper integrals, specifically analyzing cases of convergence and divergence. It establishes that if an integral converges as x approaches 0 from the positive side (x → 0+), the result is definitively zero. However, it also highlights that even in cases of divergence, a finite value may still be achievable depending on the rate of divergence, illustrated through functions such as f(t) = 1 and f(t) = 1/t. The discussion encourages experimentation with f(t) = 1/tα for α > 1 to explore these concepts further.

PREREQUISITES
  • Understanding of improper integrals
  • Familiarity with convergence and divergence concepts
  • Basic knowledge of limits in calculus
  • Experience with function behavior analysis
NEXT STEPS
  • Explore the properties of improper integrals in more depth
  • Investigate the convergence criteria for various functions
  • Learn about the comparison test for improper integrals
  • Experiment with different functions to analyze their divergence rates
USEFUL FOR

Students and educators in calculus, mathematicians interested in integral analysis, and anyone seeking to deepen their understanding of improper integrals and their evaluation.

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Homework Statement


Evaluating the following formula:
upload_2015-10-23_22-41-31.png

The Attempt at a Solution


Since the integral part is unknown, dividing the case into two: converging and diverging
If converging: the overall value will always be 0
If diverging: ...?
 
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As you say, if the integral converges for ##x \to 0^+##, the result is always zero. However, even if the integral diverges, it is still possible that one can get a finite value. This depends on the speed of divergence. Try it out with ##f(t) = 1## and ##f(t) = 1/t##. What happens for ##f(t) = 1/t^\alpha, \alpha > 1##?
 

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