Remote Access Proceedings of the American Mathematical Society
Green Open Access

Proceedings of the American Mathematical Society

ISSN 1088-6826(online) ISSN 0002-9939(print)

 

 

Universal bounds and monotonicity of ordinal invariants


Author: James R. Boone
Journal: Proc. Amer. Math. Soc. 83 (1981), 641-644
MSC: Primary 54D50; Secondary 54A25
DOI: https://doi.org/10.1090/S0002-9939-1981-0627711-5
MathSciNet review: 627711
Full-text PDF Free Access

Abstract | References | Similar Articles | Additional Information

Abstract: The tightness of a topological space provides a universal bound for all ordinal invariants determined by weak topologies generated by collections of subsets. All ordinal invariants are monotonic decreasing for pseudo-open mappings.


References [Enhancements On Off] (What's this?)


Similar Articles

Retrieve articles in Proceedings of the American Mathematical Society with MSC: 54D50, 54A25

Retrieve articles in all journals with MSC: 54D50, 54A25


Additional Information

DOI: https://doi.org/10.1090/S0002-9939-1981-0627711-5
Keywords: Natural cover, ordinal invariant, tightness, pseudo-open
Article copyright: © Copyright 1981 American Mathematical Society