Recent content by steveurkell

what ever happens, please do not delete any thread or post in this forum this site is cool, it rocks, it rules as valuable as discussions with professors I wonder if there is any limit to the size of the forum?is there any bandwidth limit?

I use Taylor expansion of e^x where x now is a matrix, e^A= I + A +A^2/2!+A^3/3!+... taking the determinant of both sides det(e^A)=det(I+...) where the right hand side will just be sum of determinants of all terms since for skew-symmetric matrix A transpose = -A, then on can show det(A)=0...

Hi, I just want to share my curiosity in the definition of 4-vector quantities such as world line 4-vector x^alpha, 4-velocity vect, gauge potential etc. the ones with subscript for indices usually have the first component with negative sign and the ones with superscript for indices have all...

Hi everyone, I now have difficulties in using formula for gradient of tensor. The following is tensor for field strength Fsubscripts_alpha_beta = [ 0 -Ex -Ey -Ez Ex 0 Bz -By Ey -Bz 0 Bx Ez By -Bx 0 ] My question is, how do we derive the Maxwell equations...

could anyone here tell me how to get post script (ps) software please, perhaps free download source if possible. There are a lot of online sources in ps format which make me have this ps program in my pc. thank you

thank you before my first posting, I had tried to use the geometrical series expansion, but I performed the summation inside the integral and I didn't realize that with limit of integration from 0 to infinity, I just could replace x by 0. thanks anyway

Hello everyone, I cannot solve the following integral integral from 0 to infinity of (x^3)/(exp(kx)-1) dx with k>0 as you may be able to guess, this integral is very famous one which can be used to deduce Stefan-Boltzmann's radiation law those of you who are experts may quickly recognize it...