Title: Differentiation properties of class ${L}^1([0,1]^2)$ with respect to two different basis of rectangles
Abstract: It is a well-known result by Saks \cite{Saks1934} that there exists a function $f \in L^1(\mathbb{R}^2)$ so that for almost every $(x,y)\in \mathbb{R}^2$ \[ \lim_{\substack{\mathrm{diam} R\rightarrow 0, \\ (x,y) \in R \in \mathcal{R}}}\left|\frac{1}{|R|}\int_R f(x,y)\, dxdy\right|=\infty, \] where $\mathcal{R}=\{[a,b)\times [c,d)\colon a<b></b>