# Non linear differential equation

by Terilien
Tags: differential, equation, linear
$$e^{2a}(da'' +2da^2 + \frac{2da}{r}) = L$$
 P: 66 Non linear differential equation Is it not $$a^{\prime \prime} + 2 a^{\prime 2} + \frac{2a}{r} = L e^{-2a}$$ and, presumably the derivative is with respect to r, yes?