The Mardesic factorization theorem for extension theory and cseparation
Authors:
Michael Levin, Leonard R. Rubin and Philip J. Schapiro
Journal:
Proc. Amer. Math. Soc. 128 (2000), 30993106
MSC (1991):
Primary 54F45, 55M10
Published electronically:
April 28, 2000
MathSciNet review:
1664406
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Abstract: We shall prove a type of Mardesic factorization theorem for extension theory over an arbitrary stratum of CWcomplexes in the class of arbitrary compact Hausdorff spaces. Our result provides that the space through which the factorization occurs will have the same strong countability property (e.g., strong countable dimension) as the original one had. Taking into consideration the class of compact Hausdorff spaces, this result extends all previous ones of its type. Our factorization theorem will simultaneously include factorization for weak infinitedimensionality and for Property C, that is, for Cspaces. A corollary to our result will be that for any weight and any finitely homotopy dominated CWcomplex , there exists a Hausdorff compactum with weight and which is universal for the property and weight . The condition means that for every closed subset of and every map , there exists a map which is an extension of . The universality means that for every compact Hausdorff space whose weight is and for which is true, there is an embedding of into . We shall show, on the other hand, that there exists a CWcomplex which is not finitely homotopy dominated but which has the property that for each weight , there exists a Hausdorff compactum which is universal for the property and weight .
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Additional Information
Michael Levin
Affiliation:
Department of Mathematics, Tulane University, New Orleans, Louisiana 70118
Address at time of publication:
Department of Mathematics, Texas Tech University, Lubbock, Texas 79409
Email:
mlevin@mozart.math.tulane.edu
Leonard R. Rubin
Affiliation:
Department of Mathematics, The University of Oklahoma, 601 Elm Avenue, Room 423, Norman, Oklahoma 73019
Email:
lrubin@ou.edu
Philip J. Schapiro
Affiliation:
Department of Mathematics, Langston University, Langston, Oklahoma 73050
Email:
pjschapiro@lunet.edu
DOI:
http://dx.doi.org/10.1090/S0002993900053533
PII:
S 00029939(00)053533
Keywords:
Cohomological dimension,
covering dimension,
extension theory,
inverse sequences,
inverse systems,
inverse limits,
compactification,
Marde\v{s}i\'{c} factorization,
weight,
universal compactum,
homotopy domination,
Cspace,
weak infinitedimension,
strong countabledimension
Received by editor(s):
March 19, 1998
Received by editor(s) in revised form:
November 13, 1998
Published electronically:
April 28, 2000
Additional Notes:
A portion of this work was completed while the firstnamed author was a J. Clarence Karcher Visitor in the Department of Mathematics at the University of Oklahoma.
Communicated by:
Alan Dow
Article copyright:
© Copyright 2000
American Mathematical Society
