Globally simple Heffter arrays $H(n;k)$ when $k\equiv 0,3\mathrm{mod}4$

K. Burrage, Nicholas J. Cavenagh, D. Donovan +1

Square Heffter arrays are $n\times n$ arrays such that each row and each column contains $k$ filled cells, each row and column sum is divisible by $2nk+1$ and either $x$ or $-x$ ap…