# Thread: Transformation to integarl equations

1. ## Transformation to integarl equations

Hi All ;
I need the solution of the following questions :
Transform the boundary value problem
$\displaystyle y''+y=f(s) , y(0)=y(\pi)=0$
into an integral equation.

And thanks alot

2. Is f(s) differentiable? Or are there any regularity conditions on it?

3. Is $\displaystyle y$ a function of $\displaystyle s$?