图上独立圈若干问题的结构参数(英文)
全新正版未拆封
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78.85
6.2折
¥
128
全新
库存2件
作者高云澍 编
出版社科学出版社
出版时间2020-06
版次1
装帧其他
上书时间2024-10-03
商品详情
- 品相描述:全新
图书标准信息
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作者
高云澍 编
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出版社
科学出版社
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出版时间
2020-06
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版次
1
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ISBN
9787030649928
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定价
128.00元
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装帧
其他
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开本
16开
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页数
240页
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字数
300千字
- 【内容简介】
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¡¡¡¡The study of graph theory started over two hundreds years ago. The earliest known paper is due to Euler£¨1736£© about the seven bridges of Korugsberg. Since 1960s£¬ graph theory has developed very fast and numerous results on graph theory sprung forth. There are many nice and celebrated problems in graph theory£¬ such as Hamiltonian problem£¬ four-color problem£¬ Chinese postman problem£¬ etc. Moreover£¬ graph theory is widely applied in chemistry£¬ computer science£¬ biology and other disciplines. As a subfield in discrete mathematics£¬ graph theory has attracted much attention from all perspectives.
¡¡¡¡All graphs are considered only finite£¬ simple£¬ undirected graphs with no loops and no multiple edges. Let G be a graph. The Hamiltonian cycle problem is one of the most well-known problems in graph theory. A cycle which contains every vertex of G is called a Hamiltonian cycle. A cycle is called a chorded cycle if this cycle contains at least one chord. A k-factor in a graph G is a spanning k-regular subgraph of G£¬ where k is a positive integer. There exists many interesting results about the existence of k-factor£¬ by applying Tutte's Theorem£¬ however£¬ we mainly focus on the existence of 2-factor throughout this thesis. Clearly£¬ a Hamiltonian cycle is a 2-factor with exactly one component. From this point of view£¬ it is a more complex procedure to find the condition to ensure the existence of 2-factor in a given graph. The most usual technique to resolve 2-factor problems is to find a minimal packing and then extend it to a required 2-factor.
¡¡¡¡The book is concerned with structural invariants for packing cycles in a graph and partitions of a graph into cycles£¬ i.e.£¬ finding a prescribed number of vertex-disjoint cycles and vertex-partitions into a prescribed number of cycles in graphs. It is well-known that the problem of determining whether a given graph has such partitions or not£¬ is NP-complete. Therefore£¬ many researchers have investigated degree conditions for packing and partitioning. This book mainly focuses on the following invariants for such problems£º minimum degree£¬ average degree £¨also extremal function£©£¬ degree sum of independent vertices and the order condition with minimum degree.
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