The naive generator bound for large truncations of perfect ideals

Let (R,m)(R,\mathfrak{m}) be a regular local ring, let JJ be a perfect ideal of grade g>1g>1, and let nn be a positive integer. Write μ()\mu(-) for the minimal number of generators.

The naive generator bound. If

μ(J+mn/mn)(g+n3g2),\mu(J+\mathfrak{m}^n/\mathfrak{m}^n)\geq \begin{pmatrix} g+n-3\\ g-2 \end{pmatrix},

then

μ(J)(g+n2g1).\mu(J)\leq \begin{pmatrix} g+n-2\\ g-1 \end{pmatrix}.

The paper explicitly states that this conjecture is false as written and later gives counterexamples, so the claim is refuted.

Sources & referencesView supporting material

Primary source

Raymond C Heitmann, “Numbers of Generators of Perfect Ideals”, arXiv:2212.13620 (2022).

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