C. David Leach

collaborators

2 papers

math.CO2019

Signed magic rectangles with three filled cells in each column

Abdollah Khodkar, David Leach, Brandi Ellis

A {\em signed magic rectangle} $S M R (m, n; k, s)$ is an $m \times n$ array with entries from $X$ , where $X = {0, \pm 1, \pm 2, \dots,$ $\pm (mk - 1) /2}$ if $mk$ is odd and $X = \{\pm1,\pm2…

math.CO2018

Magic rectangles with empty cells

Abdollah Khodkar, David Leach

A magic rectangle of order $m \times n$ with precisely $r$ filled cells in each row and precisely $s$ filled cells in each column, denoted $M R (m, n; r, s)$ , is an arrangement of the nu…