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Partitioning 3-homogeneous latin bitrades
Authors:Carlo Hämäläinen
Institution:(1) Department of Mathematics, The University of Queensland, St. Lucia, 4072 Brisbane, Australia
Abstract:A latin bitrade $${(T^{\diamond},\, T^{\otimes})}$$ is a pair of partial latin squares that define the difference between two arbitrary latin squares $${L^{\diamond} \supseteq T^{\diamond}}$$ and $${L^{\otimes} \supseteq T^{\otimes}}$$ of the same order. A 3-homogeneous bitrade $${(T^{\diamond},\, T^{\otimes})}$$ has three entries in each row, three entries in each column, and each symbol appears three times in $${T^{\diamond}}$$. Cavenagh 2] showed that any 3-homogeneous bitrade may be partitioned into three transversals. In this paper we provide an independent proof of Cavenagh’s result using geometric methods. In doing so we provide a framework for studying bitrades as tessellations in spherical, euclidean or hyperbolic space. Additionally, we show how latin bitrades are related to finite representations of certain triangle groups.
Keywords:Latin square  Latin bitrade  Triangle group  Tessellation
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