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 |