Zeng's deflation conjecture for ultrasingular irreducible components

From papers

Let FF be a polynomial system, let V(F)\textbf{V}(F) denote its solution set, and let VV(F)V\subseteq\textbf{V}(F) be a kk-dimensional ultrasingular irreducible component. Thus there is a nonempty Zariski open set UVU\subseteq V consisting of geometric smooth points and a constant n0>kn_0>k such that

N(J(x))=n0\mathscr{N}\left(J(\textbf{x})\right)=n_0

for every xU\textbf{x}\in U. For a solution x^\hat{\textbf{x}}, let (n0,n1,,ni0)(n_0,n_1,\ldots,n_{i_0}) be its deflation sequence, and call this sequence regular when its stabilized value equals the local dimension.

Zeng's deflation conjecture. The recursive deflation process terminates after finitely many steps, the deflation sequences of all points xU\textbf{x}\in U are equal and regular, and for every point x^VU\hat{\textbf{x}}\in V\setminus U with deflation sequence (n0,n1,,ni0)(n_0,n_1,\ldots,n_{i_0}),

dimx^V(F)ni0.\dim_{\hat{\textbf{x}}}\textbf{V}(F)\geq n_{i_0}.

The conjecture extends the known regularity of deflation for isolated singular solutions to positive-dimensional ultrasingular components. Its first assertion predicts finite termination and recovery of the component dimension at generic smooth points; its second gives a lower bound for the local dimension at the remaining points. The supplied text gives no resolution, so the status is open.

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Sources & referencesView supporting material

Primary source

Xin Li, Liping Zhang and Yifen Ke, “Deflation conjecture and local dimensions of Brent equations”, arXiv:2310.11686 (2024).

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