Universal Segre-SM classes for multi-singularity constructible functions

For a stable map f:MNf:M\to N, let M(η)(f)M(\underline{\eta})(f) be the closure of the locus of tuples of distinct points mapping to a common point, with the map-germ at each point having the prescribed stable multi-singularity type η\underline{\eta}. Let αη\alpha_{\underline{\eta}} and βη\beta_{\underline{\eta}} be the corresponding source and target multi-singularity constructible functions, and let ci=ci(f)c_i=c_i(f) denote the quotient Chern classes and sIs_I the Landweber–Novikov classes. Universal Segre-SM class conjecture. For any stable multi-singularity type η\underline{\eta} in relative codimension κ\kappa, there exist power series tpSM(αη)tp^{{\rm SM}}(\alpha_{\underline{\eta}}) and tpSM(βη)tp^{{\rm SM}}(\beta_{\underline{\eta}}) in the classes cic_i and sIs_I such that, for every stable map f:MNf:M\to N of relative codimension κ\kappa,

tpSM(αη)=c(TM)1C(αη),tpSM(βη)=c(TN)1C(βη)tp^{{\rm SM}}(\alpha_{\underline{\eta}})=c(TM)^{-1}C_*(\alpha_{\underline{\eta}}), \qquad tp^{{\rm SM}}(\beta_{\underline{\eta}})=c(TN)^{-1}C_*(\beta_{\underline{\eta}})

in H(M)H^*(M) and H(N)H^*(N), respectively. This would simultaneously generalize the universal Segre-SM classes for mono-singularities and the Thom polynomials of multi-singularities; the cited low-dimensional results support the conjecture, but its general status is unresolved.

Sources & referencesView supporting material

Primary source

Toru Ohmoto, “Singularities and Characteristic Classes for Differentiable Maps”, arXiv:1309.0661 (2014).

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