We consider $h>0$ and $f \in L^1(\mathbb{R})$. We have $F(x) = \int_0^x f(t)dt$.
How to express $F_h : x \rightarrow \int_x^{x+h} f(t)dt $ in the form $ f* \delta_h$ for a $\delta_h \in L^{\infty}(\mathbb{R})$ ?
I really need help for this. Someone could help me ?