The XXX was named for whom?
Monge array
An m-by-n matrix is said to be a Monge array if, for all \scriptstyle i,\, j,\, k,\, \ell such that 1\le i < k\le m\text( and )1\le j < \ell\le n one obtains A(i,j) + A(k,\ell) \le A(i,\ell) + A(k,j).