I am trying to grasp this stuff, but it is getting late and my mind is noodeling. Can I have some help on this?
show that d(λmu) = m(1-(u^2/c^2)^(-3/2) du
λ = 1/√(1-(u^2/c^2))
The Attempt at a Solution
I have attacked this through integration and differentiation, but am still missing something