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Applications of a Vietoris-Begle theorem for multi-valued maps to the cohomology of hyperspaces. (English) Zbl 0326.54008


MSC:

54B20 Hyperspaces in general topology
54F15 Continua and generalizations
55N99 Homology and cohomology theories in algebraic topology
54C60 Set-valued maps in general topology
54G20 Counterexamples in general topology
Full Text: DOI