Recent content by benabean

Hi PF, I am looking for some advice on textbooks or lecture course material that covers cyber security. I know it is a broad topic so as my background is in physics, I guess beginning at the introductory level would suit me best. I am interested in texts that include mathematical approaches...

A similar set up that might help you is to consider yourself swinging on a swing. When are you moving fastest?

I have a simple question about the general solution to Laplace's equation in spherical co-ords. The general solution is: u(r, \theta, \phi) = \sum^{\infty}_{l=0}\sum^{l}_{m=-l}\left(a_{lm}r^{l} + \frac{b_{lm}}{r^{l+1}}\right)P_{lm}(cos\theta)e^{im\phi} (where the a_{lm}, b_{lm}...

I am having trouble evaluating the Legendre Polynomials (LPs). I can do it by Rodrigues' formula but I am trying to understand how they come about. Basically I have been reading Mary L. Boas' Mathematical Methods in the Physical Sciences, 3E. Ch.12 §2 Legendre Polynomials pg566. In the...

I was just wondering if there was an identity for such an expression. (Looking at thesage's post, it was a silly assumption; i should have remembered that expansion!) It stems from trying to prove that [\hat{H},\hat{x}\hat{p}] = [\hat{H},\hat{p}\hat{x}]. I did get this proof in the end. I was...

Can I write: [\hat{p^2},\hat{x}]\hat{p} = \hat{p}[\hat{p^2}, \hat{x}] in relation to position and momentum operators?

City of God is a definite for sure.

This guy needs some valium! Glad I don't have lectures with him at 9 on monday mornings :smile: good lecturer though.

You may find this website useful: Maths Help...working with vectors b.

thanks guys :smile:

If a quantity can be integrated is it integrable or integratable? (/integrateable?) Please verify my spelling if possible! :wink: cheers, b.

Feynman's blackboard on the day he died; 15 Feb 1988 Link

Their shoes all look identical as well

Also with transformers, each coil must be electrically insulated from the (iron) core or else the current would flow through the core.

Just thought this could be a cool little thread. When reading over Physics or Maths theories, often getting bogged down in the literature, I love putting a face to the ideas and theories which were often hard to swallow for many of the scientific community at the time. Seeing a picture of the...