Hostname: page-component-77c89778f8-fv566 Total loading time: 0 Render date: 2024-07-17T14:22:35.291Z Has data issue: false hasContentIssue false

Counting singularities

Published online by Cambridge University Press:  14 November 2011

J. W. Bruce
Affiliation:
Department of Mathematics, University College, Cork, Eire

Synopsis

In this paper we obtain information on the parity of the number of singularities associated with generic mappings and families of functions. More generally we obtain results relating homology cycles (with ℤ2 coefficients) associated with certain singularity types. The methods employed are elementary, and rely on computations of local incidence numbers associated with certain manifold partitions or stratifications. These computations are carried out for some stratifications arising naturally within singularity theory.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 1982

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

1Banchoff, T., Gaffney, T. and McCrory, C.. Cusps of Gauss mappings. Research Notes in Mathematics 55 (London: Pitman, 1982).Google Scholar
2Bruce, J. W.. On generic hypersurfaces in ℝn. Math. Proc. Camb. Philos. Soc. 90 (1981), 389394.CrossRefGoogle Scholar
3Bruce, J. W.. Duals of generic hypersurfaces. Math. Scand. 49 (1981), 3660.CrossRefGoogle Scholar
4Bruce, J. W.. Canonical stratifications of functions: the simple singularities. Math. Proc. Camb. Philos. Soc. 88 (1980), 265272.CrossRefGoogle Scholar
5Gibson, C. G., Wirthmüller, K., du Plessis, A. A. and Looijenga, E. J. N.. Topological stability of smooth mappings. Lecture Notes in Mathematics 552 (Berlin & New York: Springer, 1977).Google Scholar
6Gibson, C. G.. Singular points of smooth mappings. Research Notes in Mathematics 25 (London: Pitman, 1979).Google Scholar
7Golubitsky, M. and Guillemin, V.. Stable mappings and their singularities. Graduate Texts in Mathematics 14 (Berlin and New York: Springer, 1973).Google Scholar
8Goresky, M.. Triangulation of stratified objects. Proc. Amer. Math. Soc. 72 (1978), 193200.CrossRefGoogle Scholar
9Haefliger, A. and Kosinski, A.. Un Théorème de Thom sur les singularitiés des applications différentiables. Seminare H. Cartan E. N. S. 1956/57, Exposé No. 8.Google Scholar
10Hayden, J.. Some global properties of singularities (Thesis, University of Warwick, 1980).Google Scholar
11Hayden, J.. Some global properties of singularities I: Thom polynomials. Preprint, University of Warwick, 1980.Google Scholar
12Hayden, J.. Some global properties of singularities II: parametrised real valued maps. Preprint, University of Warwick, 1980.Google Scholar
13Looijenga, E. J. N.. Structural stability of smooth families of C-functions (Thesis, University of Amsterdam, 1974).Google Scholar
14Lyaschko, O. W.. Decomposition of simple singularities of functions. Functional Anal. Appl. 10 (1976), 122128.CrossRefGoogle Scholar
15Mather, J.. Generic projections. Ann. of Math. 98 (1973), 226245.CrossRefGoogle Scholar
16Milnor, J.. Topology form the differentiate viewpoint (Charlottesville: University Press of Virginia, 1965).Google Scholar
17Trotman, D. J. A.. Stability of transversality to a stratification implies Whitney (a)—regularity. Invent. Math. 50 (1979), 273277.CrossRefGoogle Scholar
18Wall, C. T. C.. Affine cubic functions II. Topology 19 (1980), 8998.CrossRefGoogle Scholar
19Wall, C. T. C.. Affine cubic functions I. Math. Proc. Camb. Philos. Soc. 85 (1979), 387401.CrossRefGoogle Scholar
20Wall, C. T. C.. Geometric properties of generic differentiable manifolds. In Geometry and Topology III. Rio de Janiero, July 1976. Lecture Notes in Mathematics 597 (Berlin and New York: Springer, 1977).Google Scholar