Hostname: page-component-cd9895bd7-7cvxr Total loading time: 0 Render date: 2024-12-25T14:35:02.602Z Has data issue: false hasContentIssue false

Ramified coverings, orbit projections and symmetric powers

Published online by Cambridge University Press:  24 October 2008

Albrecht Dold
Affiliation:
Mathematisches Institut der Universität, D-6900 Heidelberg, West Germany

Extract

L. Smith, in a recent paper [11], studied a class of maps X →Y which he called ramified coverings. Roughly speaking, these are maps with a multiple-valued inverse Y → SPdX; cf. 1·1. He showed that X → X/G is a ramified covering whenever a finite group G acts on X. Using results of [4] on infinite symmetric powers SPX of CW-complexes X he obtained transfer homomorphisms .

Type
Research Article
Copyright
Copyright © Cambridge Philosophical Society 1986

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

[1]Bredon, G. E.. Introduction to Compact Transformation Groups (Academic Press, 1972).Google Scholar
[2]Darbo, G.. Teoria dell'omologia in una categoria di mappe plurivalenti ponderate. Rend Sem. Mat. Univ. Padova 28 (1958), 188220.Google Scholar
[3]Dold, A.. Homology of symmetric products and other functors of complexes. Ann. of Math. 68 (1958), 5480.CrossRefGoogle Scholar
[4]Dold, A. and Thom, R.. Quasifaserungen und unendliche symmetrische Produkte. Ann. of Math. 67 (1958), 239281.CrossRefGoogle Scholar
[5]Jerrard, R. P.. Homology with multiple-valued functions applied to fixed points. Trans. AMS 213 (1975), 407427.CrossRefGoogle Scholar
[6]Kahn, D. S. and Priddy, S. B.. Transfer and stable homotopy theory. Bull. AMS 78 (1972), 981987.CrossRefGoogle Scholar
[7]Maxwell, S.. Fixed points of symmetric product mappings. Proc. AMS 8 (1957), 808815.CrossRefGoogle Scholar
[8]Maxwell, S.. The degree of multiple-valued maps of spheres. In Proceedings Topol. Santa Barbara 1977, Lect. Notes in Math. vol. 664 (1978), 123141.Google Scholar
[9]Puppe, D.. A theorem on semi-simplicial monoid complexes. Ann. of Math. 70 (1959), 379394.CrossRefGoogle Scholar
[10]Roush, F. W.. Transfer in Generalized Cohomology Theories. Thesis, Princeton U. 1972. Univ. Microfilms, Ann Arbor Mich. 1980.Google Scholar
[11]Smith, L.. Transfer and ramified coverings. Math. Proc. Cambridge Philos. Soc. 93 (1983), 485493.CrossRefGoogle Scholar
[12]Steenrod, N.. Cohomology operations, and obstructions to extending continuous functions. Colloq. lectures (mimeogr.) (Princeton, 1957).Google Scholar