[過去ﾛｸﾞ] 現代数学の系譜 工学物理雑談 古典ガロア理論も読む48 (625ﾚｽ)
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76(1): 現代数学の系譜 雑談 古典ガロア理論も読む ◆e.a0E5TtKE [sage] 2017/12/16(土) 07:44:16.55 ID:/2xvBEHK(5/58) AAS
>>5 関連
>大学数学用の掲示板を、大学数学科が主体となって、英語圏のような数学掲示板を作った方がいいだろうな、実名かせめてハンドルネーム必須でね、プロないしセミプロ用のを
”A Pointwise Lipschitz Selection Theorem Article Miek Messerschmidt”
”Acknowledgement. The author would like to thank the MathOverflow community”だと
MathOverflow communityね
https://www.researchgate.net/publication/310953191_A_Pointwise_Lipschitz_Selection_Theorem
https://www.researchgate.net/profile/Miek_Messerschmidt/publication/310953191_A_Pointwise_Lipschitz_Selection_Theorem/links/59ccb3af45851556e9878d25/A-Pointwise-Lipschitz-Selection-Theorem.pdf?origin=publication_detail Full-text (PDF)
A Pointwise Lipschitz Selection Theorem Article Miek Messerschmidt Institution University of Pretoria Department of Mathematics and Applied
Abstract
We prove that any correspondence (multi-function) mapping a metric space into a Banach space that satisfies a certain pointwise Lipschitz condition, always has a continuous selection that is pointwise Lipschitz on a dense set of its domain.
We apply our selection theorem to demonstrate a slight improvement to a well-known version of the classical Bartle-Graves Theorem: Any continuous linear surjection between infinite dimensional Banach spaces has a positively homogeneous continuous right inverse that is pointwise Lipschitz on a dense meager set of its domain.
An example devised by Aharoni and Lindenstrauss shows that our pointwise Lipschitz selection theorem is in some sense optimal: It is impossible to improve our pointwise Lipschitz selection theorem to one that yields a selection that is pointwise Lipschitz on the whole of its domain in general.
A Pointwise Lipschitz Selection Theorem (PDF Download Available). Available from: https://www.researchgate.net/publication/310953191_A_Pointwise_Lipschitz_Selection_Theorem [accessed Dec 16 2017].
つづく
77: 現代数学の系譜 雑談 古典ガロア理論も読む ◆e.a0E5TtKE [sage] 2017/12/16(土) 07:45:03.22 ID:/2xvBEHK(6/58) AAS
>>76 つづき
Acknowledgement. The author would like to thank the MathOverflow community
(Nate Eldredge in particular, for pointing out the example in Remark 3.5 to the
author), and the anonymous referees of the paper for their constructive comments
and suggestions.
(引用終り)
追記：
これ、本当は最初arXivでヒットしたが、別キーワード検索で、上記researchgateがヒットしたので、このURLを採用した
以上
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