Decoupling Differential Equations: Can Substitution Simplify the System?

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Discussion Overview

The discussion centers on the nature of a system of differential equations involving variables x and z, specifically examining whether substitution can simplify the system by decoupling the equations. The scope includes theoretical exploration of coupled versus uncoupled systems.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant presents a system of differential equations and seeks clarification on the notation used, specifically regarding the absence of a dot above z.
  • Another participant asserts that the system is coupled.
  • A subsequent participant questions what specifically makes the system coupled.
  • It is proposed that the coupling arises from the lack of equations that contain only x or only z.
  • A later reply suggests that using the substitution u=x+z and v=x-z results in a pair of uncoupled equations.

Areas of Agreement / Disagreement

Participants express differing views on the nature of the equations, with some agreeing on the coupling due to the structure of the equations, while others explore the potential for decoupling through substitution. The discussion remains unresolved regarding the implications of these substitutions.

Contextual Notes

Participants do not provide detailed definitions or assumptions regarding the terms "coupled" and "uncoupled," nor do they clarify the implications of the proposed substitution on the original equations.

delve
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[tex]\ddot{x}=\dot{z}[/tex]

[tex]\ddot{z}=\dot{x}[/tex]

there should be z with a dot above it just like the x, but there is none, and the code is correct as far as I know. Can someone help? Thanks.
 
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Coupled.
 
Last edited:
do you know what makes it coupled?
 
The fact that there are no equations that contain only x or only z.
 
Thank you :)
 
Also notice that if you use a substitution u=x+z, v=x-z, you get a pair of uncoupled equations.
 

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