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Transactions of the American Mathematical Society
Transactions of the American Mathematical Society
ISSN 1088-6850(e) ISSN 0002-9947(p)

     

Generating continuous mappings with Lipschitz mappings

Author(s): J. Cichon; J. D. Mitchell; M. Morayne
Journal: Trans. Amer. Math. Soc. 359 (2007), 2059-2074.
MSC (2000): Primary 54H15, 20M20
Posted: December 15, 2006
MathSciNet review: 2276612
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Abstract | References | Similar articles | Additional information

Abstract: If $ X$ is a metric space, then $ \mathcal{C}_{X}$ and $ \mathcal{L}_X$ denote the semigroups of continuous and Lipschitz mappings, respectively, from $ X$ to itself. The relative rank of $ \mathcal{C}_{X}$ modulo $ \mathcal{L}_{X}$ is the least cardinality of any set $ U\setminus \mathcal{L}_{X}$ where $ U$ generates $ \mathcal{C}_{X}$. For a large class of separable metric spaces $ X$ we prove that the relative rank of $ \mathcal{C}_{X}$ modulo $ \mathcal{L}_X$ is uncountable. When $ X$ is the Baire space $ \mathbb{N}^{\mathbb{N}}$, this rank is $ \aleph_{1}$. A large part of the paper emerged from discussions about the necessity of the assumptions imposed on the class of spaces from the aforementioned results.


References:

1.
S. Banach, Sur un theorème de M. Sierpinski, Fund. Math. 25 (1935) 5-6.

2.
H. Cook, Continua which admit only the identity mapping onto non-degenerate subcontinua, Fund. Math. 60 (1967) 241-249. MR 0220249 (36:3315)

3.
J. Cichon and M. Morayne, Universal functions and generalized classes of functions, Proc. American Math. Soc. 102 (1988) 83-89. MR 0915721 (89c:26003)

4.
R. Engelking, On closed images of the space of irrationals, Proc. Amer. Math. Soc. 21 (1969) 583-586. MR 0239571 (39:928)

5.
F. Galvin, Generating countable sets of permutations, J. London Math. Soc. 51 (1995) 230-242. MR 1325568 (96a:20005)

6.
P.M. Higgins, J.M. Howie and N. Ruškuc, Generators and factorisations of transformation semigroups, Proc. Roy. Soc. Edinburgh Sect. A 128 (1998) 1355-1369. MR 1663980 (2000a:20139)

7.
P.M. Higgins, J.M. Howie, J.D. Mitchell and N. Ruškuc, Countable versus uncountable ranks in infinite semigroups of transformations and relations, Proc. Edinburgh Math. Soc. 46 (2003) 531-544. MR 2013951 (2004h:20093)

8.
P. M. Higgins, J. D. Mitchell, M. Morayne and N. Ruškuc, Rank properties of endomorphisms of infinite partially ordered sets, Bull. London Math. Soc. 38 (2006) 177-191. MR 2214470

9.
J.M. Howie, N. Ruškuc and P. Higgins, On relative ranks of full transformation semigroups, Comm. Algebra 26 (1998) 733-748. MR 1606221 (99b:20099)

10.
K. Kuratowski, Topology, Vol. I, Academic Press, New York, London; Panstwowe Wydawnictwo Naukowe, Warsaw 1966. MR 0217751 (36:840)

11.
T. Mackowiak, Singular arc-like continua, Dissertationes Math. (Rozprawy Mat.) 257 (1986). MR 0881290 (88f:54066)

12.
W. Sierpinski, Sur les suites infinies de fonctions définies dans les ensembles quelconques, Fund. Math. 24 (1935)

209-212.

13.
S. Subbiah, Some finitely generated subsemigroups of $ S(X)$, Fund. Math. 86 (1975) 221-231. MR 0405383 (53:9177)

14.
H. Vaughan, On locally compact metrisable spaces, Bull. Amer. Math. Soc, 43 (1937) 532-535.

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Additional Information:

J. Cichon
Affiliation: Institute of Mathematics, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
Email: Jacek.Cichon@pwr.wroc.pl

J. D. Mitchell
Affiliation: Mathematics Institute, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, Scotland
Email: jdm3@st-and.ac.uk

M. Morayne
Affiliation: Institute of Mathematics and Computer Science, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
Email: Michal.Morayne@pwr.wroc.pl

DOI: 10.1090/S0002-9947-06-04026-8
PII: S 0002-9947(06)04026-8
Keywords: Relative ranks, functions spaces, continuous mappings, Lipschitz mappings, Baire space
Received by editor(s): January 28, 2005
Posted: December 15, 2006
Copyright of article: Copyright 2006, American Mathematical Society




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