## Covering Walks in GraphsCovering Walks in Graphs is aimed at researchers and graduate students in the graph theory community and provides a comprehensive treatment on measures of two well studied graphical properties, namely Hamiltonicity and traversability in graphs. This text looks into the famous Kӧnigsberg Bridge Problem, the Chinese Postman Problem, the Icosian Game and the Traveling Salesman Problem as well as well-known mathematicians who were involved in these problems. The concepts of different spanning walks with examples and present classical results on Hamiltonian numbers and upper Hamiltonian numbers of graphs are described; in some cases, the authors provide proofs of these results to illustrate the beauty and complexity of this area of research. Two new concepts of traceable numbers of graphs and traceable numbers of vertices of a graph which were inspired by and closely related to Hamiltonian numbers are introduced. Results are illustrated on these two concepts and the relationship between traceable concepts and Hamiltonian concepts are examined. Describes several variations of traceable numbers, which provide new frame works for several well-known Hamiltonian concepts and produce interesting new results. |

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2-connected Ä i Ä complete graph contains a Hamiltonian contains exactly cycle decomposition cycle in G cyclic ordering decomposition of G degv diam D G diam(G diameter digraph edge of G end-vertex Euler Eulerian circuit Eulerian graph Eulerian trail exactly once G contains G is Eulerian G is Hamiltonian G of order graph containing graph G graph of order graph theory Hamiltonian cycle Hamiltonian graph Hamiltonian path Hamiltonian walk Hamiltonian-connected homogeneously traceable graph hypohamiltonian induced subgraph initial vertex integer irregular Eulerian walk Lemma Let G linear ordering non-Hamiltonian nontrivial connected graph nontrivial tree number of bridges number of odd odd cycles odd number open trails ordering of V(G pair Petersen graph positive integer Proof rad(G randomly Eulerian result spanning tree Theorem total traceable number traceable walk Traveling Salesman Problem tree of order upper Hamiltonian number v e V(G verify vertices of G walk in G