3 problems

Let $A=(a_{ij})$ be an $n\times n$ nonnegative matrix of rank at most $k$, with row sums $r_1,\ldots,r_n$ and column sums $c_1,\ldots,c_n$. For $k,n\in\mathbb{N}$ with…

Let $\mathcal{M}_n^+$ denote the set of $n\times n$ nonnegative real matrices. Let $R_n^{\overline{k}}$ and $L_n^{\overline{k}}$ be the sets of row-stochastic and column-stochastic…

Let $\mathcal{V}_2$ denote the variety of $3 \times n$ matrices of rank at most $2$, with $n \geq 3$. ML-degree conjecture. The ML degree of $\mathcal{V}_2$ equals … This conjectur…