Skip to Main Content

Proceedings of the American Mathematical Society

Published by the American Mathematical Society since 1950, Proceedings of the American Mathematical Society is devoted to shorter research articles in all areas of pure and applied mathematics.

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

The 2020 MCQ for Proceedings of the American Mathematical Society is 0.85.

What is MCQ? The Mathematical Citation Quotient (MCQ) measures journal impact by looking at citations over a five-year period. Subscribers to MathSciNet may click through for more detailed information.

 

Can the fundamental (homotopy) group of a space be the rationals?
HTML articles powered by AMS MathViewer

by Saharon Shelah PDF
Proc. Amer. Math. Soc. 103 (1988), 627-632 Request permission

Abstract:

We prove that for any topological space which is metric, compact (hence separable) path connected and locally path connected, its homotopy group is not the additive group of the rational, moreover if it is not finitely generated then it has the cardinality of the continuum.
References
  • Leo Harrington and Saharon Shelah, Counting equivalence classes for co-$\kappa$-Souslin equivalence relations, Logic Colloquium ’80 (Prague, 1980) Studies in Logic and the Foundations of Mathematics, vol. 108, North-Holland, Amsterdam-New York, 1982, pp. 147–152. MR 673790
  • Paul Olum, Non-abelian cohomology and van Kampen’s theorem, Ann. of Math. (2) 68 (1958), 658–668. MR 96218, DOI 10.2307/1970160
  • S. Shelah, Can the fundamental group of a nice space be equivalent the rationals? Abstracts Amer. Math. Soc. 5 (1984), 217.
  • Saharon Shelah, On co-$\kappa$-Souslin relations, Israel J. Math. 47 (1984), no. 2-3, 139–153. MR 738165, DOI 10.1007/BF02760513
  • Edwin H. Spanier, Algebraic topology, McGraw-Hill Book Co., New York-Toronto, Ont.-London, 1966. MR 0210112
  • E. Van Kampen, On the connection between the fundamental groups of some related spaces, Amer. J. Math. 55 (1933), 261-267.
Similar Articles
  • Retrieve articles in Proceedings of the American Mathematical Society with MSC: 55Q05, 03E15, 03E40
  • Retrieve articles in all journals with MSC: 55Q05, 03E15, 03E40
Additional Information
  • © Copyright 1988 American Mathematical Society
  • Journal: Proc. Amer. Math. Soc. 103 (1988), 627-632
  • MSC: Primary 55Q05; Secondary 03E15, 03E40
  • DOI: https://doi.org/10.1090/S0002-9939-1988-0943095-3
  • MathSciNet review: 943095