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On noncontractible compacta with trivial homology and homotopy groups
Author(s):
Umed
H.
Karimov;
Dusan
Repovs
Journal:
Proc. Amer. Math. Soc.
138
(2010),
1525-1531.
MSC (2010):
Primary 54F15, 55N15;
Secondary 54G20, 57M05
Posted:
December 8, 2009
MathSciNet review:
2578548
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Abstract:
We construct an example of a Peano continuum such that: (i) is a one-point compactification of a polyhedron; (ii) is weakly homotopy equivalent to a point (i.e. is trivial for all ); (iii) is noncontractible; and (iv) is homologically and cohomologically locally connected (i.e. is an HLC and space). We also prove that all classical homology groups (singular, Čech, and Borel-Moore), all classical cohomology groups (singular and Čech), and all finite-dimensional Hawaiian groups of are trivial.
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Additional Information:
Umed
H.
Karimov
Affiliation:
Institute of Mathematics, Academy of Sciences of Tajikistan, Ul. Ainy 299A, Dushanbe 734063, Tajikistan
Email:
umedkarimov@gmail.com
Dusan
Repovs
Affiliation:
Faculty of Mathematics and Physics, and Faculty of Education, University of Ljubljana, P.O. Box 2964, Ljubljana 1001, Slovenia
Email:
dusan.repovs@guest.arnes.si
DOI:
10.1090/S0002-9939-09-10217-4
PII:
S 0002-9939(09)10217-4
Keywords:
Noncontractible compactum,
weak homotopy equivalence,
reduced complex $\widetilde {K}_{\mathcal {C}}$-theory,
admissible spectrum,
Peano continuum,
infinite-dimensional Hawaiian earrings,
Hawaiian group
Received by editor(s):
November 25, 2008,
Received by editor(s) in revised form:
August 7, 2009, and September 18, 2009
Posted:
December 8, 2009
Dedicated:
Dedicated to the memory of Professor Evgenij Grigor'evich Sklyarenko (1935-2009)
Communicated by:
Alexander N. Dranishnikov
Copyright of article:
Copyright
2009,
American Mathematical Society
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