Existence of Some Signed Magic Arrays

Abstract

We consider the notion of a signed magic array, which is an $m\times n$ rectangular array with the same number of filled cells $s$ in each row and the same number of filled cells $t$ in each column, filled with a certain set of numbers that is symmetric about the number zero, such that every row and column has a zero sum. We attempt to make progress toward a characterization of for which $(m,n,s,t)$ there exists such an array. This characterization is complete in the case where $n=s$ and in the case where $n=m$; we also characterize three-fourths of the cases where $n=2m$.

33 pages, 24 figures