Recent content by sjw11

Sammy, Apologies I forgot to put that in ψ=rP p=P not ρ cheers

I am working on an exam question, I have the solution but i can't figure out a step in between, I need to show that ∂P/∂r = (1/r)∂ψ/∂r - ψ/r^2 I am wondering where the - ψ/r^2 comes from. I.e. which rule is this, and sencondly how does this apply to higher order differentials. Thanks in...