## Ars Combinatoria, Volume 23, Part 1Department of Combinatorics and Optimization, University of Waterloo., 1987 - Combinatorial analysis |

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### Contents

Additive Permutations of Cardinality Seven by Jaromir Abrham | 7 |

Covers of Symmetric Designs by R E L Aldred and CD Godsil | 29 |

Total Concepts in Graph Theory by M Behzad | 35 |

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### Common terms and phrases

additive permutations adjacent algorithm automorphism bipartite chromatic number colour comparability graph complete graph Computer Science conjugacy classes contradiction Corollary cycle defined denote Department of Mathematics digraphs disjoint distance-regular distance-regular graphs dominating set edges elements embeds in 4-space exists felicitous finite graph forcing sequence function G contains given graph G Graph Theory Hence histogram i-channel i-exchanges independent set induced subgraph integers intersection array isomorphic Kent Ridge Latin rectangle Latin square Lemma Let G Math minimal normal subgroup minimally critical National University node obtained OR-nodes path of length planar drawing positive integers prime problem Proof rectilinear drawing result Singapore 0511 strongly sensitive subdrawings subgraph of G subgroup of G subset Suppose symmetric graphs symmetry Theorem total chromatic tree triangles University of Singapore vertex degrees vertex of degree vertex set vertices of G