2008/04/02 by Füsun Akman, Akman, Fusun
Engineering · #Combinatorics (math.CO) #FOS: Mathematics #General Mathematics (math.GM) #graph theory and CDMA systems
paper · pdf · doi:10.48550/arxiv.0804.0284
openalex publication_date 2008/04/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Sudoku grids can be thought of as graphs where the vertices are the squares of the grid, and edges join vertices in the same row, column, or sub-grid. A Sudoku puzzle corresponds to a partial proper coloring of the Sudoku graph. We provide a new and simpler proof of the theorem which states that the number of completions of partial colorings of a graph is a polynomial in the number of colors (originally due to Herzberg and Murty). Moreover, we construct Sudoku squares of arbitrary size with distinct entries on both diagonals (a similar proof was first published by Keedwell, unknown to the author).