Difference in differential and partial differential

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Discussion Overview

The discussion focuses on the differences between ordinary differential equations and partial differential equations, particularly in the context of their application in physics and the mathematical techniques used to solve them. Participants explore the implications of these differences for understanding and solving equations in physics.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions how much understanding of physics is restricted by not having studied partial differential equations, given their experience with ordinary differentials.
  • Another participant notes that ordinary differential equations typically have a finite number of states, while partial differential equations can have an infinite number of states.
  • A participant expresses interest in the mathematical techniques for solving these equations, indicating that the distinction makes sense to them.
  • One participant mentions that the wave equation can be solved using the method of separation of variables, providing links to resources for further reading.
  • A question is raised about whether all equations can be solved using ordinary differential equations if they involve only one variable, suggesting a condition regarding the number of variables involved.
  • Another participant points out that there are conditions for the existence of solutions to differential equations and mentions that some systems may be better represented by difference equations rather than differential equations.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and interest in the differences between ordinary and partial differential equations. There is no consensus on the implications of these differences for solving equations in physics, and multiple viewpoints are presented regarding the conditions for solving these equations.

Contextual Notes

Some participants reference specific mathematical theorems and techniques, but the discussion does not resolve the complexities involved in the conditions for existence and the methods of solving differential equations.

bassplayer142
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How much of a difference is there in between partial and regular differential equations. I took differentials but not the partial and I was wondering how much this restricts understanding in physics. Our physics class doesn't solve the differential equations (though some I can). Does normal first order and higher order techniques work. (cauchy euler, substitution, integrating factor)...
 
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Well, an obvious difference is usually differential equations have a finite number of states while partial differential equations have an infinite number of states.
 
That makes sense to me. I'm really interested in the mathmatical techniques to solve them. But what you said does make sense.
 
Can all equations be solved using regular differential equation if and only if the derivative is only of one variable. Say that there isn't two separate variables being differentiated?
 
There are conditions that must be satisfied for the existence of differential equations.
http://en.wikipedia.org/wiki/Picard-Lindelöf_theorem

Now if a solution exists, solving it is another matter. Some systems such as discrete systems are more practical to represented in terms of difference equations then differential equations.
 

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