Deprecated: $wgMWOAuthSharedUserIDs=false is deprecated, set $wgMWOAuthSharedUserIDs=true, $wgMWOAuthSharedUserSource='local' instead [Called from MediaWiki\HookContainer\HookContainer::run in /var/www/html/w/includes/HookContainer/HookContainer.php at line 135] in /var/www/html/w/includes/Debug/MWDebug.php on line 372
Chains of spaces - MaRDI portal

Chains of spaces (Q689612)

From MaRDI portal





scientific article; zbMATH DE number 446221
Language Label Description Also known as
English
Chains of spaces
scientific article; zbMATH DE number 446221

    Statements

    Chains of spaces (English)
    0 references
    0 references
    15 November 1993
    0 references
    A partial ordering \(\vartriangleleft\) of the class of topological spaces is considered: \(X\vartriangleleft Y\) if \(X\) is homeomorphic to a nowhere dense closed subset of \(Y\). It is shown that for every linear ordering \(A\) of cardinality at most continuum there exists a chain of copies of \(\beta \omega\) isomorphic to \(A\). This theorem generalizes the earlier result of the author [Colloq. Math. Soc. Janos Bolyai 41, 261-267 (1985; Zbl 0615.54003)] for \(A={\mathfrak c}\) with its natural order.
    0 references
    0 references
    0 references

    Identifiers