Combinatorial triangulation conjecture for the Łojasiewicz exponent

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Let f∈C{x0,x1,…,xn}f\in\mathbb{C}\{x_0,x_1,\ldots,x_n\} be a Newton nondegenerate function germ with an isolated singularity at 00. Assume that ff does not have a Morse point at 00, or that nn is even. Let T\mathcal{T} be a triangulation of Γ(f)\Gamma(f), let Tne\mathcal{T}_{\mathrm{ne}} be the set of simplices satisfying

Cap(T)CNN(T/T)=0,\mathop{\mathrm{Cap}}(T)\mathop{\mathrm{CN}_{\mathfrak{N}}}(\mathcal{T}/T)=0,

and let FneT\mathcal{F}_{\mathrm{ne}}^{\mathcal{T}} be the associated set of coordinate facets. Then

Combinatorial triangulation conjecture.

L(f,0)=max⁡T∈Tnedeg⁡(CNN(T/T))−1=max⁡F∈FneTM(F)−1.\mathop{\mathcal{L}}(f,0)=\max_{T\in\mathcal{T}_{\mathrm{ne}}}\deg\bigl(\mathop{\mathrm{CN}_{\mathfrak{N}}}(\mathcal{T}/T)\bigr)-1 =\max_{F\in\mathcal{F}_{\mathrm{ne}}^{\mathcal{T}}}\mathcal{M}(F)-1.

This is the paper's fuller triangulation-based proposal, relating the Łojasiewicz exponent to combinatorial Newton data. It is presented after the counterexample to the earlier conjecture, and the source gives no resolution.

References

Primary source

Baldur Sigurðsson, “On the Jacobian polygon and Łojasiewicz exponent of isolated complex hypersurface singularities”, arXiv:2509.06150 (2025).

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