The Kuo condition, an inequality of Thom's type and (C)-regularity
The Kuo condition, an inequality of Thom's type and (C)-regularity
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Kuo 条件,Thom 型不等式和 (C)-正则性
DOI:
10.1016/s0040-9383(97)00020-7
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
S. Koike
中科院分区:
文献类型:
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作者:
K. Bekka;S. Koike
Given a Ck mappingf: 02”+ FP’withf (0)= 0, let us consider the behaviour offor the form of the zero set f-‘(O). Even locally, they are very complicated in general. Therefore, it is natural to ask when we can truncatefso that the behaviour or the form of the zero set of the truncation is similar to that off. This problem concerns the property of sufficiency of jets. Roughly speaking, sufficiency of jets is the property that all mappings with the same truncation have the same structure.We review some results on sufficiency of jets. Let br,,(n, p) denote the set of C” map-germs:((W”, O)+(lRP, O), let j’f (O) d enote the r-jet offat OE [w” forfE dc,,(n, p), and let J*(n, p) denote the set of r-jets in &,,(n, p)(s 3 Y). We sayf, g E Bt,,(n, p) are CO-equivalent, if there is a local homeomorphism a:([W”, O)+([W”, 0) such that f= g 0 (T. We further say f, g E bc, s,(n, p) are V-equivalent (resp. SV-equivalent), iff-’(0) is homeomorphic to g-‘(0) as germs at 0 E [w”(resp. there is a local homeomorphism a:(llY’, O)-+([W”, O) such that o (f-‘(0))= g-‘(0)). We call an r-jet w E J’(n, p) CO-sufficient (resp. V-sufficient, SV-sufficient) in 6c, s,(n, p)(s> r), if any two maps f, gEgC1,(n, p) with j* f (O)= jrg (0)= w are Coequivalent (resp. V-equivalent, SV-equivalent). Concerning CO-sufficiency of jets in the function case (ie p= l), we have