Why Does n_0(x) Fail to Satisfy the Spherical Bessel Equation?

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SUMMARY

The discussion centers on the failure of the function n_0(x) = - \frac{1}{x} \sum_{s \geq 0} \frac{(-1)^s}{(2s)!} x^{2s} to satisfy the spherical Bessel equation given by r^2 \frac{d^2R}{dr^2} + 2r \frac{dR}{dr} + [k^2 r^2 - n(n + 1)] R = 0. Participants highlight the importance of correctly applying the direct substitution method and ensuring that all terms align with the spherical Bessel equation's requirements. The discussion emphasizes the need for careful manipulation of series and derivatives to achieve a valid solution.

PREREQUISITES
  • Understanding of spherical Bessel functions
  • Familiarity with differential equations
  • Knowledge of series expansions and convergence
  • Proficiency in calculus, particularly in differentiation and substitution
NEXT STEPS
  • Study the properties of spherical Bessel functions
  • Learn about the method of direct substitution in differential equations
  • Explore series convergence criteria and their implications in solutions
  • Investigate common pitfalls in manipulating series and derivatives
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Mathematicians, physicists, and students studying differential equations, particularly those interested in solutions to spherical Bessel equations and series analysis.

Logarythmic
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What am I missing when I'm unsuccessful in showing by direct substitution into the spherical Bessel equation

[tex]r^2 \frac{d^2R}{dr^2} + 2r \frac{dR}{dr} + [k^2 r^2 - n(n + 1)] R = 0[/tex]

that

[tex]n_0 (x) = - \frac{1}{x} \sum_{s \geq 0} \frac{(-1)^s}{(2s)!} x^{2s}[/tex]

is a solution?

What's the catch??
 
Last edited:
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Ok, if there is no catch, can someone give me at starter here?
 

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