Thread: Reduced mass transformation

In deriving the reduced mass two-body Hamiltonian from Bethe and Salpeter's book I encountered the attached text. I am unsure of the details behind how they arrive at the first two equations of (5.2). I am looking for the explicit steps in reaching the formulas directly following 'we have...' if anyone can help out

Are you familiar with the chain rule for partial derivatives? Applying it should give you the formulas.

--Kevin C.

Hi Kevin,

Thanks for the reply. I employed the chain rule as suggested and it all came out nicely.