What are the Laplace transforms of powers of y?

Click For Summary

Discussion Overview

The discussion revolves around the Laplace transforms of powers of a function y(t), specifically whether expressions like y^2 or y^3 have unique Laplace transforms and how to calculate them. The scope includes theoretical aspects of Laplace transforms and their application to non-linear operations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions if powers of y, such as y^2 or y^3, have unique Laplace transforms and expresses difficulty in calculating them using the standard integral approach.
  • Another participant references a Wikipedia page that discusses properties of Laplace transforms, suggesting there might be a formula for the Laplace transform of f(t)^n.
  • A different participant challenges the existence of a formula for the Laplace transform of powers, indicating confusion with the notation for derivatives instead.
  • One participant acknowledges the lack of an explicit formula for the Laplace transform of powers after a clarification on notation.
  • Another participant suggests that the multiplication of functions might provide a way to approach the problem, referencing the Wikipedia page again.
  • It is noted that Laplace transforms work efficiently with linear operations but become complicated with non-linear operations like multiplication and powers, often requiring convolutions.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the existence of a formula for the Laplace transform of powers of functions, with multiple competing views and uncertainties expressed throughout the discussion.

Contextual Notes

Limitations include the lack of explicit formulas for the Laplace transforms of powers, dependence on definitions of operations, and the complexity introduced by non-linear operations.

space-time
Messages
218
Reaction score
4
Let's say you have a function y(t). You know how derivatives of y have their own Laplace transforms? Well I was wondering if powers of y such as y^2 or y^3 have their own unique Laplace transforms as well. If so , how do you calculate them (because plugging them into the usual integral doesn't seem to work)?
 
  • Like
Likes   Reactions: makemoneyu
Physics news on Phys.org
  • Like
Likes   Reactions: makemoneyu
Ssnow said:
On https://en.wikipedia.org/wiki/Laplace_transform, there is a table with properties of Laplace transform, one refer to the Laplace transform of ##f(t)^{n}## ...

Are you sure? I don't see such a formula. Unless you are mistaking the one for ##f^{(n)}(t)## which is the n'th derivative. I have never seen a formula for ##\mathcal L f(t)^n## and I don't think there is a general one.
 
Last edited:
LCKurtz said:
Are you sure?

Yes sorry I confuse the notation, I fact there isn't and explicit formula for this ...
 
On that same wikipedia page, there seems to be a way to do that if we consider the Laplace transform of the multiplication of functions; we just take the function f(t) and multiply it n times.
 
Laplace transform is an efficient tool when linear operations are involves (sum, derivative, integral).
But it is not so, and generaly very complicated, when non-linear operations are involved (multiplication, division, power). Even in the simplest cases convolution is requiered, which is generaly arduous.
 
  • Like
Likes   Reactions: makemoneyu

Similar threads

  • · Replies 7 ·
Replies
7
Views
7K
  • · Replies 17 ·
Replies
17
Views
3K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 5 ·
Replies
5
Views
4K
  • · Replies 4 ·
Replies
4
Views
11K
  • · Replies 1 ·
Replies
1
Views
10K
  • · Replies 2 ·
Replies
2
Views
10K
  • · Replies 3 ·
Replies
3
Views
2K