Gib65, here: http://en.wikipedia.org/wiki/Schr%C3%B6dinger_equation

 

about half way down called "Non-relativistic Schrödinger wave equation".

Oh, and mine is an exponential fourier coeficient for a fourier series.

 

http://en.wikipedia.org/wiki/Fourier_series#Canonical_form

 

it's c_n=c_j-2N-1

 

Oh and I see where Matt is comming from, this should not be in maths.

well Matt should have simply asked for it to be Moved then, anyway, I`ve Moved it.

I quite like the QED lagrangian:

 

[math]{\cal L} = \bar \psi (x) \left( i \gamma^{\mu} \partial_{\mu} - m - e \gamma^{\mu} A_{\mu} \right) \psi (x) - \frac{1}{4} F^{\mu \nu} F_{\mu \nu}[/math]

Write out the tensor contractions, then you get a really longwinded thing

Oh and I see where Matt is comming from, this should not be in maths.

 

In that case, my apologies. Sometimes these topics can be tricky.

 

Thanks for all the formuli everyone. I've now got a lot to choose from.

Equations only "look" complicated because of the notation used. Simple looking equations may hide very deep facts behind the notation. Part of mathematics is trying to find "better" notation so that things look "obvious".

 

So really, you have to think about the notation used rather than the equations themselves.