The Andersen-Hoffman Theorem for Equitable Rectangles

Abstract

More than forty years ago, Andersen and Hoffman independently proved that every symmetric Latin rectangle can be extended to a symmetric Latin square with prescribed diagonal entries. We generalize this theorem as follows. Let $k\leq n^2$, and let $M$ be an $n\times n$ array whose top-left $r\times r$ subarray is filled with symbols from $\{1,2,\ldots,k\}$. Suppose that, for each $i\in\{1,\ldots,r\}$ and each symbol, the number of occurrences of that symbol in row $i$ equals its number of occurrences in column $i$, and that each remaining diagonal entry is either empty or already contains a symbol from $\{1,\ldots,k\}$. We establish necessary and sufficient conditions for completing $M$ so that the resulting array is symmetric off the prescribed $r\times r$ subarray, each symbol occurs a specified total number of times in $M$, and, for every symbol, its numbers of occurrences in any two rows (respectively, columns) differ by at most one. Restricted to symmetric arrays, our theorem generalizes results of Cruse (1974), Goldwasser et al. (2015), and Bahmanian and Hilton (2025). It also extends Baranyai's theorem for complete graphs (1973) by characterizing when a partial coloring of $K_r$ with a loop on every vertex can be extended to an almost regular coloring of $K_n$ with a loop on every vertex, where $n\geq r$.