Generalized Fernández de Bobadilla conjecture on critical loci

Let ff be a holomorphic function germ with critical locus Σf\boldsymbol{\Sigma} f, let Ff,0F_{f,\mathbf 0} denote its Milnor fiber at the origin, and let μC\stackrel{\circ}{\mu}_C be the transverse Milnor number associated with each irreducible component CC of Σf\boldsymbol{\Sigma} f. Generalized Fernández de Bobadilla conjecture. Suppose that

H~(Ff,0;Z)\widetilde H^*(F_{f,\mathbf 0};{\mathbb Z})

is nonzero only in degree n1n-1 and

H~n1(Ff,0;Z)CZμC,\widetilde H^{n-1}(F_{f,\mathbf 0};{\mathbb Z})\cong \bigoplus_C {\mathbb Z}^{\stackrel{\circ}{\mu}_C},

where the sum is over all irreducible components CC of Σf\boldsymbol{\Sigma} f. Then Σf\boldsymbol{\Sigma} f has a single irreducible component, which is smooth. The source introduces this as the natural generalization of Fernández de Bobadilla's conjecture; no resolution is supplied.

Sources & referencesView supporting material

Primary source

David B. Massey, “A New Conjecture, a New Invariant, and a New Non-splitting Result”, arXiv:1410.3316 (2015).

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