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.

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Sources & referencesView supporting material

Primary source

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

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