Can Second Order Non-linear ODEs Like This Be Solved Analytically?

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Discussion Overview

The discussion revolves around the solvability of a specific second order non-linear ordinary differential equation (ODE) given by s(x)'' = (a b s(x)) / ||s(x)||^3, where s is an n-dimensional vector and a and b are constants. Participants explore whether this equation can be solved analytically or if numerical methods are necessary, with a focus on solutions in 1, 2, or 3 dimensions.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions the solvability of the ODE and asks if analytical solutions exist or if numerical methods will be required.
  • Another participant suggests that the equation is a second order non-homogeneous ODE, indicating it may be linear unless s(x) has a dependency on another function y(x).
  • A later post corrects an earlier statement but does not provide further clarification on the nature of the ODE.
  • A participant reiterates the need for solutions specifically in 1, 2, or 3 dimensions, emphasizing urgency in finding a resolution.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the solvability of the ODE, and multiple interpretations of its nature remain, particularly regarding its linearity and the dimensionality of solutions.

Contextual Notes

There is uncertainty regarding the dependencies of s(x) and the implications of dimensionality on the solvability of the equation. The discussion does not resolve these aspects.

ayae
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Hello, I was wondering if anyone could shed some light upon solving this:

s(x)'' = (a b s(x)) / ||s(x)||^3

Where s is a n dimensional vector, || || is operation finding the magnitude and a and b are constants.

Is this solveable or will I have to use alternative numerical methods?
 
Last edited:
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From what I can see, this a second order non-homogeneous ODE, that is it is linear, unless s(x) depends on y(x) in some way.
 
Lord Crc said:
From what I can see, this a second order non-homogeneous ODE, that is it is linear, unless s(x) depends on y(x) in some way.

Damn, silly me. Fixed.
 
bump, I only need it solved in 1, 2 or 3 dimensions.
Anyone please?
 

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