Consider the following non linear pde in the unknown $v(x,y)$: $$ \frac{\partial v(x,y)}{\partial x} + \Big(\frac{\partial v(x,y)}{\partial x} \Big)^2 = e^{2 ty}-1 $$ where $t$ is some fixed small non zero real number. Now define the following sequence of functions: $$ v_{0}(x,y) : \equiv 0 $$ $$ v_{n+1}(x,y):= \int_{0}^{x} (e^{2 ty}-1)- \Big(\frac{\partial v_n(x^{\prime},y)}{\partial x^{\prime}} \Big)^2 d x^{\prime} $$
My question is the following: is there any hope of saying that this sequence "converges" in any reasonable sense, for small $t$? More precisely, the idea is as follows: Is there some appropriate "weighted Sobolev space" in which these functions $v_{n}(x,y)$ live; and hopefully with respect to that weighted norm, the sequence is a Cauchy sequence?
Note that it can not be the usual Sobolev space, because the function $e^{2t y}$ does not have finite $L^p$ norm.
For the time being I am not asking whether the "limit" $v$, if it exists is smooth or not. Right now all I am looking for is a "weak" solution. Eventually of course I would like to know about the regularity of $v$. But that is a meaningful question only if $v$ exists.
Every thing is over the real numbers, the functions $v(x,y)$ and $v_{n}(x,y)$ are supposed to be defined on the whole of $\mathbb{R}^2$ (at least they should be measurable with respect to the right weight). I am not imposing any boundary conditions; I am simply looking for some solution of the pde.
