Convergence of Integral with Divergent Function at 0+

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Homework Help Overview

The discussion revolves around the convergence of the integral \(\int_0^{\infty} \frac{dx}{4x^3 + x^{1/3}}\), particularly focusing on the behavior of the integrand near the lower limit of integration at \(0^+\). Participants are exploring the implications of the integrand's undefined nature at this point.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants are considering comparisons with known convergent or divergent integrals. There is uncertainty regarding the convergence of \(\int_{0}^{1} \frac{dx}{x^{1/3}}\) and its implications for the original integral. Questions about the anti-derivative of the integrand and its limit as \(x\) approaches \(0^+\) are also raised.

Discussion Status

The discussion is active, with participants questioning the behavior of the integrand and exploring different aspects of convergence. Some guidance has been offered regarding the comparison with other integrals, but no consensus has been reached on the convergence of the original integral.

Contextual Notes

Participants note that the integrand is undefined at \(0\), which raises questions about the limits and behavior of the integral in that region. There is also mention of using specific formatting for mathematical expressions, indicating a focus on clarity in communication.

Aki
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I want to know if the integral

\int_0^{\infty} dx/(4x^3 + x^(1/3))

is convergent or divergent?Thanks
 
Last edited:
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What have you tried? Have you compared it with integrals whose convergece/divergence you know? Keep in mind your integrand is also undefined at 0.

Use {} instead of () to group things in latex, click on \int_{0}^{\infty}
 
Well I'm just not sure what happens when

\int_{0}^{1}dx/x^{1/3}

I think it converges, but I"m not too sure.
because when that function is below 1/x on the graph
 
Last edited:
What is the anti-derivative of \frac{1}{x^{\frac{1}{3}}}= x^{-\frac{1}{3}}
 
Last edited by a moderator:
Is the function \frac{1}{4x^{3}+x^{1/3}} ? If so, what is its limit to 0^{+} ?

Daniel.
 

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