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A class of latin squares derived from finite abelian groups

Anthony B. Evans (2014)

Commentationes Mathematicae Universitatis Carolinae

We consider two classes of latin squares that are prolongations of Cayley tables of finite abelian groups. We will show that all squares in the first of these classes are confirmed bachelor squares, squares that have no orthogonal mate and contain at least one cell though which no transversal passes, while none of the squares in the second class can be included in any set of three mutually orthogonal latin squares.

A uniqueness result for 3 -homogeneous latin trades

Nicholas J. Cavenagh (2006)

Commentationes Mathematicae Universitatis Carolinae

A latin trade is a subset of a latin square which may be replaced with a disjoint mate to obtain a new latin square. A k -homogeneous latin trade is one which intersects each row, each column and each entry of the latin square either 0 or k times. In this paper, we show that a construction given by Cavenagh, Donovan and Drápal for 3 -homogeneous latin trades in fact classifies every minimal 3 -homogeneous latin trade. We in turn classify all 3 -homogeneous latin trades. A corollary is that any 3 -homogeneous...

Algorithm for the complement of orthogonal operations

Iryna V. Fryz (2018)

Commentationes Mathematicae Universitatis Carolinae

G. B. Belyavskaya and G. L. Mullen showed the existence of a complement for a k -tuple of orthogonal n -ary operations, where k < n , to an n -tuple of orthogonal n -ary operations. But they proposed no method for complementing. In this article, we give an algorithm for complementing a k -tuple of orthogonal n -ary operations to an n -tuple of orthogonal n -ary operations and an algorithm for complementing a k -tuple of orthogonal k -ary operations to an n -tuple of orthogonal n -ary operations. Also we find some...

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