Page:Electromagnetic phenomena.djvu/4



§ 4. We shall further transform these formulae by a change of variables. Putting

and understanding by l another numerical quantity, to be determined further on, I take as new independent variables

and I define two new vectors $$\mathfrak{d}'$$ and $$\mathfrak{h}'$$ by the formulae

for which, on account of (3), we may also write