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。
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.
出处
《甘肃农业大学学报》
CAS
CSCD
1999年第3期303-306,共4页
Journal of Gansu Agricultural University
关键词
广义字典序积
自同态
强自同态
E-S不可收缩性
generalized lexicographic product
endomorphism
strong endomorphism
E-S unretractive
