1. The problem statement, all variables and given/known data I have to show that in 3-d, Lx (angular momentum) is Hermitian. 2. Relevant equations In order to be Hermitian: Integral (f Lx g) = Integral (g Lx* f) Where Lx=(hbar)/i (y d/dz - z d/dy) and f and g are both well behaved functions: f(x,y,z) and g(x,y,z) 3. The attempt at a solution I know to do this I have to do integration by parts. I got to the point where I had to figure out, using integration by parts,: Integral [f(x,y,z) y (dg(x,y,z)/dz) dx] And I cannot figure this out :( I set: u=f(x,y,z) y dv=(dg(x,y,z)/dz) dx So then I get: du=[df(x,y,z)/dx]y + f(x,y,z) But what is v then?? Unless I'm completely off-track already, in which case, help would be great!