A Systematic Approach to Filling m-by-n Numerical Arrays
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This paper develops a systematic way to fill any m-by-n numerical array where the row and column constraints are specified and the sum of the row constraints is equal to the sum of the column constraints. This problem has both relevance, due to the growing interest in numerical puzzles, and applications, especially to the field of algebraic geometry. In this paper, it is shown that any m-by-n numerical array with the given specifications can be filled, and a directional row-by-row filling algorithm is developed for doing so. However, many of even the simplest numerical arrays have multiple possible fillings, and we seek to arrive at a way of finding how many fillings any given array has. We develop a formula for the number of fillings for m-by-d arrays, where d is the sum of the row constraints and the sum of the column constraints, and each column constraint is equal to 1. Then we proceed to find formulas for the number of fillings for 2-by-2, 2-by-3, 2-by-4, 2-by-n, 3-by-3, and 3-by-n arrays. In the process, we develop the necessary techniques, insights, and notation to enable us to develop a formula for the number of fillings for a general m-by-n array.
G. Stolyarov II is an actuary, science fiction novelist, independent philosophical essayist, poet, amateur mathematician, composer, contributor to Enter Stage Right, Le Quebecois Libre, Rebirth of Reason, and the Ludwig von Mises Institute, Senior Writer for The Liberal Institute, former weekly columnist for GrasstopsUSA.com, and Editor-in-Chief of The Rational Argumentator, a magazine championing the principles of reason, rights, and progress. Mr. Stolyarov also publishes his articles on Helium.com and Associated Content to assist the spread of rational ideas. He holds the highest Clout Level (10) possible on Associated Content and is one of Associated Content's Page View Millionaires. Mr. Stolyarov has also written a science fiction novel, Eden against the Colossus, a non-fiction treatise, A Rational Cosmology, and a play, Implied Consent. You can watch his YouTube Videos. Mr. Stolyarov can be contacted at email@example.com.
Learn about Mr. Stolyarov's novel, Eden against the Colossus, here.