4 problems

GGR conjecture. The $\binom{n+1}{2}$ limits $D_{m,k}$ for $0\leq k<m\leq n$ should be enough for $f$ to be $n$ times Peano differentiable at $c$.

For $n\geq2$, let $D_{\mathcal{A}}^s$ be an $n$-th symmetric generalized Riemann differentiation. A symmetric MZ differentiation is one for which, for every function $f$, both the…

Let $D_n$ denote the $n$-th Riemann differentiation, and let an MZ differentiation mean an $n$-th generalized Riemann differentiation equivalent to the $n$-th Peano derivative for…

Let $D_{\mathcal{A}}$ be an $n$-th generalized Riemann differentiation at a point $x$. An MZ differentiation is one for which, for every function $f$ that is $n-1$ times Peano diff…