| 关于图的E-S不可收缩性的一个结果 |
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| 引用本文： | 薛自学. 关于图的E-S不可收缩性的一个结果[J]. 甘肃农业大学学报, 1999, 34(3): 303-306 |
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| 作者姓名： | 薛自学 |
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| 作者单位： | 甘肃农业大学基础部!兰州７３００７０ |
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| 摘 要： | 推广了Ｋｎａｕｅｒ的结论：ＥｎｄC2n+1[Y]End［Ｙ］＝sEnd到广义字典序积，得到了C2n[Yx|x(C2n+1)]是Ｅ－Ｓ不可收缩的充分必要条件是每个Ｙｘ皆Ｅ－Ｓ不可收缩的。
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| 关 键 词： | 广义字典序积 自同态 强自同态 E－S不可收缩性 |
A result on E-S unretractivity of graphs |
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| Xue Zixue. A result on E-S unretractivity of graphs[J]. Journal of Gansu Agricultural University, 1999, 34(3): 303-306 |
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| Authors: | Xue Zixue |
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| Abstract: | Knauer's conclusion is further discussed in this paper. In the generalized lexicographicproduct, the conclusion End End Y=S End Y is generalized into a newconclusion that the sufficient and necessary condition of being E-S unretrative iseach Yx being E-S unretractive. |
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| Keywords: | generalized lexicographic product endomorphism strong endomorphism E-S unretractive |
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