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-Boltzman's radiation law
those of you who are experts may quickly recognize it...