Recent content by The-herod

Great, I'll have a look at this now. Thanks!:smile:

Hello, I have to learn about the classic Perturbation Theory. I'm looking for guides, textbooks etc about Perturbation Theory. I already know the basis (Poincare method), but I found it hard to find resources for more advanced material on the one hand, that will also teach it from basis on...

Hi again! I tried to read a book about perturbation theory. I understood, more or less, at the beginning. But from some point, I hardly understand. I think the main reason is that I don't have a sufficient background in solving differential equations. I'm not sure though. So what I'm doing...

So I guess you deserve a welcome back! No problem... I should be the one thanking you for answer me in such consistency. Thanks a lot:) That's what I did for in the meanwhile. Now I know that's all I had to do. I don't really see the point of using perturbation here (as you said, it's easy to...

After thinking about it a little bit more, I understand that even without the perturbation, the equation is non-linear, though I as much as I know, it is possible to solve it. So I should obviously get nonlinear equations. Does that mean that equation should be able to be solved, though it is...

And... I'm back again. I think, technically, this message should be in the h.w. forum, but consider the fact that it's a continuance of the previous messages... I thought I should put it here. If I should still move it to the h.w. forums, please give me a note. I tried to solve the question I...

Mine too. I thought you meant to it, but I thought about it as velocity (instead of angular velocity...). OK, so it is small, I'll use it, thanks:) I see now. Which is why the two-timing works much better. I have no more questions at the moment, but I warn, I'll probably be back in the near...

You're right, I didn't noticed that in that context. I guess I'll develop sensitivity for that with time... However, wouldn't it be a bad approximation in such a case? because \Omega is not a very small parameter, definitely bigger than 1, so the series supposes to diverge, no? (because in...

Thanks a lot! Actually, this is the mission that my tutor gave me for now. I already calculated by hand, the Jacobian of this problem, to simplify the solution with a linearization. Found out to be a wrong one, after I actually understood the material, thanks to you. That means that for start...

It supposes to work on a PC too. Though, you should notice two things: 1) It connects through a USB. Not a big deal, but I rather PS/2. The USB connection requires more process time. As I said, not a big deal, but I prefer to buy a USB-PS/2 transformer. 2) I understand it a small mouse, which is...

Logitech are usually good. I couldn't understand what is the second item... is it a pad for the mouse? if it is, you probably don't need one. Laser mouse's don't need a pad. About the keyboard, I don't see what it's all about. Unless you use it a lot (and then you should buy ergonomic...

I'm sorry to annoy. But all I need is a V/X, please, so I'll know if what I'm doing is right... Sorry for being a bit bothersome... And thanks a lot again.

Actually, I see no reason, at least in the beginning, to buy Mathematica. For most students and professors I know who tried Maxima, it satisfied all their needs. For Matlab the possibilities are usually less satisfy, indeed... Although they worth a try (Scilab, Euler, Octave).

Are you sure about the "\usepackage{graphics}"? Maybe there are couple of packages... In all my documents it "\usepackage{graphicx}". By the way, we can also specify which file exactly you want by entering the full name, like "sin.png" etc. If you have a priority of file types you want to use...

Sorry I didn't answer earlier, I was asleep... I think I got it now. For every problem it's necessary to find it's own "develop" in perturbation theory, so it will fit to the method (means, it will be a linear equation each step). In other words, you have to choose what you consider as a...