Universal Segre-SM classes for multi-singularity constructible functions

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For a stable map f:M→Nf: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:M→Nf: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.

References

Primary source

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

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