Recent content by hermitian

hi, may someone help me to clarify my doubts... in my work, i encounter diracdelta square \delta(x-x_1)\delta(x-x_2) i am not sure what it means... it seems if i integrate it \int dx \;\delta(x-x_1)\delta(x-x_2) = \delta(x_1-x_2) is either zero of infinity. is this correct? thanks

hi, today i learned that if the mass in Schrödinger equation is not a constant, then Schrödinger equation is not valid. Is there any reason why is it so? Also, what is the different of the time dependent mass m(t) and let say a time dependent angular frequency \omega(t) in a harmonic...

hmm... the usual sense of isomorphism... where there is a structure preserving bijective map from R^2 to R^1. sorry is my question still vague?

Hi, I understand that the open interval (0,1) is isomorphic to the real line \mathbb{R}^1 May i know whether there is also isomorphism from \mathbb{R}^2 to \mathbb{R}^1 thanks a lot!

thanks Avodyne, i spend sometime to convince myself that I can use any basis I like in the degenerate subspace...

Hi, I know that for degenerate states, we need to apply degenerate perturbation theory by looking at the perturbative hamiltonian in the subspace of the degenerate states. What then if the states still degenerate after we cast them the generate subspace. Is there a way to find the zero...