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Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826 (e) ISSN 0002-9939 (p)
     

The span for Hausdorff continua

Author(s): Antonio Peláez
Journal: Proc. Amer. Math. Soc.
MSC (2000): Primary 54F15; Secondary 54H25, 54E15
Posted: October 26, 2009
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Abstract: The author previously defined the surjective semispan for Hausdorff continua and he proved that chainable continua have empty surjective semispan. In this paper, we define the semispan, the surjective span and the span of a Hausdorff continuum. We characterize the emptiness of these notions in terms of universal mappings to prove that a continuum has empty span (semispan) if and only if each of its subcontinua has empty surjective span (semispan). We also prove that the emptiness of these notions is invariant under inverse limits.


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K. P. Hart, B. J. van der Steeg, Span, chainability and the continua $ \mathbb{H}^{\ast}$ and $ \mathbb{I}_u$, Topology Appl., 151(2005), 226-237. MR 2139754 (2006m:54063)

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A. Lelek, On the surjective span and semispan of connected metric spaces, Colloq. Math., 37(1977), 35-45. MR 0482680 (58:2737)

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A. Peláez, The surjective semispan for Hausdorff continua, to appear in Topology and its Applications.


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Additional Information:

Antonio Peláez
Affiliation: Universidad Autónoma de la Ciudad de México, Plantel Cuautepec, Avenida la Corona 320, Gustavo A. Madero, C.P. 07160, México D. F.
Email: pelaez@matem.unam.mx

DOI: 10.1090/S0002-9939-09-10123-5
PII: S 0002-9939(09)10123-5
Keywords: Hausdorff continua, span, surjective span, semispan, surjective semispan
Received by editor(s): December 5, 2008,
Received by editor(s) in revised form: April 16, 2009
Posted: October 26, 2009
Communicated by: Alexander N. Dranishnikov
Copyright of article: Copyright 2009, American Mathematical Society
The copyright for this article reverts to public domain after 28 years from publication.


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