## Congressus Numerantium, Volumes 99-100 |

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### Contents

Combinatorially Based Cryptography for Children and Adults | 9 |

Preservers Of A Fixed Degree Sequence by LeRoy B Beasley | 27 |

Recent Results Involving the Rank of the Adjacency Matrix of a Graph | 33 |

Copyright | |

34 other sections not shown

### Common terms and phrases

adjacency matrix adjacent algorithm application approximation back-edge bijection blocking set bound cn+1 coefficients color combinatorial competition graph complete complete graph computation condition consider construction contains convex corresponding cryptography cryptosystems cut vertex cycle equivalent defined definition degree sequence denote digraph Duality edge edges colored elements equations example exists Figure formula fractional programming function fuzzy set given graph G Graph Theory Hadamard matrices Hence implies integer invariant prepolynomial isomorphic isosurface Krylov subspace Krypto Latin squares Lemma Let G linear Math Mathematics matrix method MOFS of type NP-complete obtained Oellermann OMEP optimal origami orthogonal arrays pair parameters partition path perfect code permutations planar graphs points polynomial problem processor projective plane Proof regular graph rook's graph solution Steiner subgraph subset Suppose Theorem Theory tree unilateral orientation unique University of Manitoba variables vector visualization zero