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ON THE CANONICAL STRATIFICATION OF COMPLEX ANALYTIC FUNCTIONS J. W. BRUCE In the Thorn-Mather proof of the density of topologically stable mappings Whitney stratifications of large parts of the jet spaces J\n, p) are constructed (see [4]). These stratifications yield a topological classification of germs of finite singularity type which satisfy a natural multitransversality condition with respect to the given stratification, for two such germs whose jets are in the same connected stratum are topologically equivalent. The construction of the stratifications mentioned above essentially reduces to the problem of finding a minimal Whitney stratification of a versal unfolding of each jet of finite singularity type. However apart from the rather easy case of simple singularities [2] the problem of determining this minimal stratification even for complex analytic functions with isolated singularity is very difficult. Indeed the answer is not known even for the simple elliptic families E , k = 6, 7, 8. Using results of Hironaka [6] we give a necessary (numerical) condition for a given family of complex analytic functions with isolated singularities to constitute a canonical stratum; namely the number of cusps (see [8]) must be constant along the family. Examples of Greuel [5] then furnish
Bulletin of the London Mathematical Society – Wiley
Published: Mar 1, 1980
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