## Abstract

It is well known that if n is even, the addition table for the integers modulo n (which we denote by B_{n}) possesses no transversals. We show that if n is odd, then the number of transversals in B_{n} is at least exponential in n. Equivalently, for odd n, the number of diagonally cyclic latin squares of order n, the number of complete mappings or orthomorphisms of the cyclic group of order n, the number of magic juggling sequences of period n and the number of placements of n non-attacking semi-queens on an n × n toroidal chessboard are at least exponential in n. For all large n we show that there is a latin square of order n with at least (3.246)^{n} transversals. We diagnose all possible sizes for the intersection of two transversals in B_{n} and use this result to complete the spectrum of possible sizes of homogeneous latin bitrades. We also briefly explore potential applications of our results in constructing random mutually orthogonal latin squares.

Original language | English |
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Pages (from-to) | 136-146 |

Number of pages | 11 |

Journal | Discrete Applied Mathematics |

Volume | 158 |

Issue number | 2 |

DOIs | |

Publication status | Published - 28 Jan 2010 |

Externally published | Yes |