Short retractions of CAT(1) spaces
Short retractions of CAT(1) spaces
复制标题
CAT(1) 空格的短缩回
DOI:
10.1090/proc/15268
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发表时间:
2021
影响因子:
1
通讯作者:
Petrunin, Anton
中科院分区:
文献类型:
--
作者:
Lytchak, Alexander;Petrunin, Anton
We construct short retractions of a CAT(1) space to its small convex subsets. This construction provides an alternative geometric description of an analytic tool introduced by Wilfrid Kendall. Our construction uses a tractrix flow which can be defined as a gradient flow for a family of functions of certain type. In an appendix we prove a general existence result for gradient flows of time-dependent locally Lipschitz semiconcave functions, which is of independent interest.
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