Recent content by Kidiz

I agree with a user that said to get dual monitors and just open the book in one of them. This is useful specially with programming books.. Getting a second-monitor is a great use of one's money.

The ##X## is most likely an argument of the function ##\sin##, that is, it should be inside the brackets. Why are you studying quantum mechanics without doing calculus first? You should definitely study calculus before. This is the simplest math you'll encounter. But answering your question...

Doing this would also help future readers, in case your picture gets deleted or something.

I'm imagining something like this: http://sketchtoy.com/64403013 I said that the particle couldn't be in C, only in A. But now that I think about it, I don't see why it could not be in C.

For epsilon = 0, we'd have no potential inside the box, so the solution would be ##\Psi _ n = \sqrt{2/b} \sin {\dfrac{n \pi x}{b}}##. I say that it's not the same because there's a space (below the potential line) in which the particle can not be. Is it the same though?

Homework Statement The bottom of an infinite well is changed to have the shape $$V(x) = \epsilon \sin {\dfrac{\pi x}{b}}, 0 \le x \le b$$ Calculate the energy shifts for all the excited states to first order in ##\epsilon##. Note that the well originally had ##V(x) = 0## for ##0 \le x \le...

Let's say we've a system which can be described by the Hamiltonian: $$H_0 = \dfrac{p^2}{2m} + V(x)$$ Now suppose we introduce a perturbation given by: $$H_1 = \lambda x^2$$ Our total hamiltonian: $$H = H_0 + H_1 = \dfrac{p^2}{2m} + V(x) + \lambda x^2 $$ Normally, the perturbation doesn't...

I'm not sure what you mean but bitcoin has been growing quite a lot, as a payment option. More and more businesses are accepting bitcoin. Thanks for mocking the suggestion though, I suppose.

How does one use a credit card without paypal? Will that work in countries where paypal is not supported? One other reason to use bitcoin: No transaction fees. Premium membership could either be cheaper or PF gets more money, when someone pays with bitcoin. And then there's also the whole...

Do you think it's a good idea though? I'm not even sure your message was not automatic, as you replied pretty fast. Do you plan to support bitcoin in the future?

Hey there, Some people love the book: "Introduction to electrodynamics", by Griffiths. Check it out and see if it's your cup of tea.

Hello there, This forum seems to be quite interesting and I'm glad I found it. I also noticed that there is a premium option, which currently accepts paypal as a payment option. Might I suggest bitcoin as an alternative to paypal? There might be a lot of people who cannot use paypal but would...

This post is of very low quality. I suggest you find a university's site, look at their catalogue and find out what classes they offer.

What do you need Topology and Differential geometry for?

You need complex analysis as well.