Is this integral correct? (expanding the Bessel function into power series )

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Homework Help Overview

The discussion revolves around the correctness of an integral involving the Bessel function, specifically focusing on its expansion into a power series and the implications of integrating term by term.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the validity of an integral equality and discuss the impact of changing the Bessel function to a different form. Questions arise regarding the correctness of the initial expansion and the resulting factors in the integral.

Discussion Status

The conversation is active, with participants providing feedback on the original poster's approach and suggesting modifications. There is an acknowledgment of a potential error in the factor associated with the integral, and a change of variables is mentioned as a means to clarify the issue.

Contextual Notes

Participants are considering the implications of specific forms of the Bessel function and how these affect the integral's outcome. There is an indication that the original problem may have constraints or assumptions that are still under examination.

Rfael
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Homework Statement
integral equality: is this integral correct ?
Relevant Equations
$$ exp(-x)= \int_{0}^{\infty}J_0 (\sqrt{xt})exp(-t) $$
i have expanded the bessel function into power series and integration term by term
 
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Rfael said:
Homework Statement: integral equality: is this integral correct ?
Almost! According to Mathematica your result is missing a factor of 4:

1750020161500.webp
 
thanks how about if i put ##J_0 ( 2\sqrt{xt})## instead my original bessel function ?
 
Rfael said:
thanks how about if i put ##J_0 ( 2\sqrt{xt})## instead my original bessel function ?
Yes, that removes the factor of 4 from the answer, as is evident by making a change-of-variables in the first integral above:
1750020896404.webp
 
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