2023/10/06 by Sayan Deb Dutta, Dutta, Sayan, Mandal, Ayanava +4 · 1 citation
Mathematics · #11C20 #12H99 #15B05 #39A06 #Advanced Combinatorial Mathematics #Combinatorics (math.CO) #Commutative Algebra (math.AC) #FOS: Mathematics #Mathematical Dynamics and Fractals #Mathematics and Applications #Number Theory (math.NT) #Rings and Algebras (math.RA)
paper · pdf · doi:10.48550/arxiv.2310.04401
openalex publication_date 2023/10/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We say that a chessboard filled with integer entries satisfies the neighbour-sum property if the number appearing on each cell is the sum of entries in its neighbouring cells, where neighbours are cells sharing a common edge or vertex. We show that an n× n chessboard satisfies this property if and only if n≡ 5\pmod 6. Existence of solutions is further investigated of rectangular, toroidal boards, as well as on Neumann neighbourhoods, including a nice connection to discrete harmonic functions. Construction of solutions on infinite boards are also presented. Finally, answers to three dimensional analogues of these boards are explored using properties of cyclotomic polynomials and relevant ideas conjectured.