What Does Ordinary Mean in Ordinary Differential Equations?

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Discussion Overview

The discussion centers around the meaning of the term "ordinary" in the context of ordinary differential equations (ODEs). Participants explore the characteristics that distinguish ODEs from partial differential equations (PDEs) and the implications of these distinctions for solving such equations.

Discussion Character

  • Conceptual clarification
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • Some participants inquire about the meaning of "ordinary" and its significance in the classification of differential equations.
  • It is noted that an ordinary differential equation involves derivatives with respect to a single variable, distinguishing it from partial differential equations that involve multiple variables.
  • One participant suggests that "ordinary" refers to the derivatives being taken with respect to the only variable that the unknown function depends on.
  • There is a mention of integrating as a method to solve differential equations, though it is clarified that this term may not apply literally in all cases.
  • Examples of ordinary differential equations are provided, highlighting the variety of methods available for solving them.
  • A caution is raised regarding the use of total differentials in the context of ODEs, suggesting a need for careful consideration.

Areas of Agreement / Disagreement

Participants express differing views on the implications of the term "ordinary" and the methods for solving differential equations, indicating that multiple competing perspectives remain in the discussion.

Contextual Notes

Some statements reflect assumptions about the definitions of ordinary and partial differential equations, and there are unresolved nuances regarding the terminology and methods for solving these equations.

chandran
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what is the word ordinary mean? Why is it called so.

Am i correct to say that the solution of a differential equation is got by
integrating that equation.
 
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chandran said:
what is the word ordinary mean? Why is it called so.
An ordinary differential equation has derivatives with respect to one variable.

[tex]\frac{dy(x)}{dx} + x = 0[/tex]

Oridnary is there to separate it from partial differential equations, which have derivatives with respect to multiple variables.

[tex]\frac{\partial y(t,x,z)}{\partial t}+\frac{\partial^2 y(t,x,z)}{\partial x^2} = z[/tex]
 
Last edited:
Ordinary means that the derivatives involved are taken wrt the only variable the unknown function depends on.

"Integrating",not literally on every occasion.But u can make an abuse of language and call solving an ODE/PDE "integrating" it.

Daniel.
 
Ordinary to differential equations with total differentials.

Example of ODE

[tex]x^2 \frac{d^2 y}{dt^2} + x \frac{dy}{dt} + 15 = 0[/tex]

There are a lot of methods to solve a differential equation...
 
Cyclovenom said:
Ordinary to differential equations with total differentials.

Example of ODE

[tex]x^2 \frac{d^2 y}{dt^2} + x \frac{dy}{dt} + 15 = 0[/tex]

There are a lot of methods to solve a differential equation...

I would be very careful with total differentials,if i were you. :wink:

Daniel.
 

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