Equality of the Schwartz index and the Euler obstruction

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Let (V,0)⊂(Cn,0)(V,0)\subset(\mathbb{C}^n,0) be a complex analytic germ, let WW be a local ambient representation, and let ν~\tilde{\nu} be a continuous vector field on WW with an isolated singularity at 00 inducing a stratified vector field ν\nu on VV. Write \mathds1V\mathds{1}_V for the indicator function of VV. Equality of the Schwartz index and the Euler obstruction.

Sch(ν,V,0)=Eu(ν~,\mathds1V,0).{\textup{Sch}}(\nu,V,0)=\textup{Eu}(\tilde{\nu},\mathds{1}_V,0).

The Schwartz index is defined for stratified vector fields with an isolated singularity, while the Euler obstruction of the constructible function \mathds1V\mathds{1}_V is defined microlocally through the characteristic cycle. The equality is presented as a conjecture because it is expected from the microlocal interpretation, but the source states that it was not seriously proved there.

References

Primary source

Xia Liao and Xiping Zhang, “Microlocal indices and Chern Classes of Foliations”, arXiv:2512.13126 (2026).

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