Combinatorial triangulation conjecture for the Łojasiewicz exponent

Let fC{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)=maxTTnedeg(CNN(T/T))1=maxFFneTM(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.

Sources & referencesView supporting material

Primary source

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

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