# Variational Principle

1. Mar 3, 2008

### Nusc

1. The problem statement, all variables and given/known data
If I'm given a potential say A(x/a-m) m an integer, (this is the sawtooth wave)
What kind of trial function should I use to approximate this?

2. Relevant equations

3. The attempt at a solution

I do recall this function arising in Fourier series. Should I actually solve for the Fourier coefficients to get a trig function? Maybe I'm making this more complicated, is there a simpler way to do this?

2. Mar 4, 2008

### genneth

Sorry, I don't really understand what the question. Is this a quantum mechanics problem -- i.e. find an estimate of the ground state and its energy using the variational method?

3. Mar 4, 2008