Remote point
In general topology, a remote point is a point that belongs to the Stone–Čech compactification of a Tychonoff space but that does not belong to the topological closure within of any nowhere dense subset of .[1]
Let be the real line with the standard topology. In 1962, Nathan Fine and Leonard Gillman proved that, assuming the continuum hypothesis:
There exists a point in that is not in the closure of any discrete subset of ...[2]
Their proof works for any Tychonoff space that is separable and not pseudocompact.[1]
Chae and Smith proved that the existence of remote points is independent, in terms of Zermelo–Fraenkel set theory, of the continuum hypothesis for a class of topological spaces that includes metric spaces.[3] Several other mathematical theorems have been proved concerning remote points.[4][5]
References
- ^ a b Van Douwen, Eric K. (1978). "Existence and applications of remote points". Bulletin of the American Mathematical Society. 84 (1): 161–164. doi:10.1090/S0002-9904-1978-14454-1. ISSN 0002-9904.
- ^ Fine, Nathan J.; Gillman, Leonard (1962). "Remote points in ". Proceedings of the American Mathematical Society. 13: 29–36. doi:10.1090/S0002-9939-1962-0143172-5.
- ^ Chae, Soo Bong; Smith, Jeffrey H. (1980). "Remote points and G-spaces". Topology and Its Applications. 11 (3): 243–246. doi:10.1016/0166-8641(80)90023-1.
- ^ Van Mill, Jan; Van Douwen, Eric (March 1983). "Spaces without remote points". Pacific Journal of Mathematics. 105 (1): 69–75. doi:10.2140/pjm.1983.105.69.
- ^ Dow, Alan (1983). "Remote points in large products". Topology and Its Applications. 16 (1): 11–17. doi:10.1016/0166-8641(83)90003-2. ISSN 0166-8641.
Content Disclaimer
Informasi ini disarikan dari Wikipedia dan disajikan kembali untuk tujuan edukasi. Konten tersedia di bawah lisensi CC BY-SA 3.0. Kami tidak bertanggung jawab atas ketidakakuratan data yang bersumber dari kontribusi publik tersebut.
- The information displayed on this website is sourced in part or in whole from Wikipedia and has been adapted for the purpose of restating it. We strive to provide accurate and relevant information, however:
- There is no guarantee of absolute accuracy. Wikipedia is an open, collaborative project that can be edited by anyone, so information is subject to change.
- It is not intended to constitute professional advice. The content displayed is for informational and educational purposes only. For important decisions (e.g., medical, legal, or financial), please consult a professional.
- Content copyright. Wikipedia is licensed under the Creative Commons Attribution-ShareAlike License (CC BY-SA). This means that content may be reused with appropriate attribution and shared under a similar license.
- Responsible use. Any risk arising from the use of information from this website is entirely the responsibility of the user.