Laplace transform of function with independent variables OTHER than time

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Discussion Overview

The discussion centers on the application of the Laplace transform to functions with independent variables other than time. Participants explore the conventional use of the Laplace transform in literature and seek examples of its application in different contexts.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions the necessity of time as the independent variable for the Laplace transform, suggesting it is a mathematical operator applicable to any variable.
  • Another participant emphasizes that most literature uses time as the independent variable and seeks examples where this is not the case.
  • There is a suggestion that one can rename the independent variable in existing examples to illustrate the Laplace transform's applicability beyond time.
  • Several participants note that in fields like electrical engineering and control systems, the Laplace transform is predominantly applied to time-dependent signals.
  • One participant references the original application of Fourier series in heat transfer along a beam, proposing that similar applications of the Laplace transform may exist for variables like length.
  • Another participant expresses that the discussion has already been helpful in considering the application of the Laplace transform in non-time contexts.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of time as the independent variable for the Laplace transform. While some argue it is flexible, others maintain that its primary applications are time-dependent. The discussion remains unresolved regarding specific examples of non-time applications.

Contextual Notes

Participants acknowledge the challenge of finding examples that explicitly exclude time as the independent variable, indicating a potential limitation in available literature or resources.

TooFastTim
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Hi all

Conventionally we used to seeing the Laplace transform applied to problems that use time as the independent variable, can anybody point me at some examples that do not use time as the independent variable?

Thanks

Tim
 
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I'm not sure what you mean. A Laplace transform is a MATHEMATICAL operator. It doesn't matter whether you interpret the variable as time or any other physical quantity.
 
Yeah, but most (the vast majority) of the literature uses time as the independent variable. I was looking for examples that do not.
 
P.S. bit of a bugger Googling "laplace transform -time" :)
 
Yeah, but most (the vast majority) of the literature uses time as the independent variable. I was looking for examples that do not.

Sure grab your examples in which t is the independent variable. Now rename t with any other letter you like, although I recommend against calling it s, which would be confusing. Now you have plenty of examples where the independent variable is not time.
 
I think the OP is looking at this from an applied standpoint. As used in electrical engineering or control systems engineering, the Laplace Transform is always(?) applied to time-dependent signals.

What real-world (i.e. engineering) problems employ Laplace Transforms where time is not the dependent variable?
 
Redbelly98 said:
I think the OP is looking at this from an applied standpoint. As used in electrical engineering or control systems engineering, the Laplace Transform is always(?) applied to time-dependent signals.

What real-world (i.e. engineering) problems employ Laplace Transforms where time is not the dependent variable?

Correct, I was thinking of an application analogous to the original application of the Fourier seies which was (I'm open to correction here) heat transfer along a beam, so the independent variable in that case would have been length along the beam. I'm sure somebody has used the Laplace transform for applications other than time dependent ones.

Actually you guys have already been a help. Thanks.
 

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