No Laplace Transform? What can be said about the function?

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Discussion Overview

The discussion revolves around the implications of a function not having a Laplace transform, exploring whether there is an equivalent intuition similar to that of functions lacking a Fourier transform. The scope includes theoretical considerations and conceptual clarifications related to transforms in engineering and mathematics.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • Some participants propose that the absence of a Laplace transform might imply certain characteristics about the function, similar to the implications of a function lacking a Fourier transform.
  • One participant expresses confusion regarding the initial assertion about Fourier transforms and seeks clarification on the implications of not having a Laplace transform.
  • Another participant describes the Laplace transform as a tool for converting time domain representations into frequency domain, suggesting that the relationship between time and frequency domains may not directly imply anything about the existence of a Laplace transform.
  • There is uncertainty about whether a lack of a Laplace transform has any specific theoretical implications, with one participant indicating a lack of clarity on this point.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the implications of a function lacking a Laplace transform, and multiple competing views remain regarding its significance.

Contextual Notes

Some statements rely on assumptions about the relationship between transforms and function properties, which are not fully explored or resolved in the discussion.

hadron23
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Hi,

We know that if a function does not have a Fourier transform, then it does not have finite energy. Is there an equivalent intuition associated with a function that does not have a Laplace transform?
 
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hadron23 said:
Hi,

We know that if a function does not have a Fourier transform, then it does not have finite energy. Is there an equivalent intuition associated with a function that does not have a Laplace transform?

Could you provide a link to your first assertion please?
 
berkeman said:
Could you provide a link to your first assertion please?

Alright, I think I got confused with something to do with Fourier Series (not transform) and Dirichlet conditions. Nevermind that first statement. The question is, what can be said about the function, if it does not have a Laplace transform?
 
Laplace Transform is just a means engineers convert representations in time domain into frequency domains in engineering. Things in time domain do happen in frequency domain. as F= 1/T. Convolution (which is complicated) in the time domain means multiplication in the frequency domain - which helps things out.

Not too sure there is any existence between if a function has no laplace means other theory.
 

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