My Math Forum Inverse laplace transform, formula help me a little ;)

 Pre-Calculus Pre-Calculus Math Forum

 January 8th, 2018, 03:41 AM #1 Newbie   Joined: Jan 2018 From: Poland Posts: 4 Thanks: 2 Inverse laplace transform, formula help me a little ;) I have to find y, but I don't have a formula to solve that one, if anyone have an idea... y=L−1[(e−2πs*s−2)/(s2+4)] Last edited by skipjack; January 8th, 2018 at 06:05 AM.
 January 8th, 2018, 04:00 AM #2 Senior Member   Joined: Oct 2009 Posts: 558 Thanks: 179 Just to make sure, you are talking about $$\mathcal{L}^{-1}\left(\frac{e - 2\pi s^2 - 2}{s^2 + 4}\right)$$ Last edited by Micrm@ss; January 8th, 2018 at 04:03 AM.
 January 8th, 2018, 04:30 AM #3 Newbie   Joined: Jan 2018 From: Poland Posts: 4 Thanks: 2 oops no, it is not that, it is hard to write it here but that one is correct L−1[(e^(-2πs-2s))/(s^2-4)]
 January 8th, 2018, 06:25 AM #4 Global Moderator   Joined: Dec 2006 Posts: 19,723 Thanks: 1807 Use the entries numbered 17 and 27 in this list of Laplace transforms.
January 8th, 2018, 08:31 AM   #5
Math Team

Joined: Oct 2011

Posts: 13,319
Thanks: 936

Quote:
 Originally Posted by Justinetea oops no, it is not that, it is hard to write it here but that one is correct L−1[(e^(-2πs-2s))/(s^2-4)]
Is −1[(e^(-2πs-2s))/(s^2-4)] a multiplication by -1?
If so, why do you show the "1"?

 January 8th, 2018, 08:57 AM #6 Newbie   Joined: Jan 2018 From: Poland Posts: 4 Thanks: 2 L-1 is an inverse of laplace transformation it should be L to the power of -1 Last edited by Justinetea; January 8th, 2018 at 09:02 AM.
 January 8th, 2018, 09:18 AM #7 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 13,319 Thanks: 936 Well, post it this way: L^(-1) or 1/L
January 8th, 2018, 10:09 AM   #8
Senior Member

Joined: Sep 2015
From: USA

Posts: 2,124
Thanks: 1103

Quote:
 Originally Posted by Denis Well, post it this way: L^(-1) or 1/L
I'm afraid I have to disagree with you Sir Denis.

Writing the inverse of a transform $\mathscr{L}$ as $\dfrac {1}{\mathscr{L}}$ gets you sent to the corner.

If I was writing in charcoal in my cave I would write it as L^(-1){} (your first choice)

Using LaTex I'd write it as $\mathscr{L}^{-1}()$

January 8th, 2018, 11:19 AM   #9
Math Team

Joined: Oct 2011

Posts: 13,319
Thanks: 936

Quote:
 Originally Posted by romsek using latex i'd write it as $\mathscr{l}^{-1}()$
yuk!!

January 8th, 2018, 03:20 PM   #10
Senior Member

Joined: Sep 2015
From: USA

Posts: 2,124
Thanks: 1103

Quote:
 Originally Posted by Denis yuk!!
hrm.. you didn't see the script capital L?

what do you see here $\mathscr{L}$

 Tags formula, inverse, laplace, transform

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post szz Differential Equations 1 November 2nd, 2014 03:18 AM szz Calculus 1 November 1st, 2014 03:14 PM Bkalma Calculus 1 May 6th, 2014 07:08 PM capea Complex Analysis 5 August 3rd, 2013 02:30 PM Deiota Calculus 1 April 28th, 2013 10:28 AM

 Contact - Home - Forums - Cryptocurrency Forum - Top