Weak and strong Eisenbud–Goto conjectures for projective toric varieties

Let XPrX\subseteq\mathbb{P}^r be a projective toric variety. Its maximal generator degree is denoted by maxdegX\operatorname{maxdeg} X, and its regularity, degree, and codimension by regX\operatorname{reg} X, degX\deg X, and codimX\operatorname{codim} X, respectively. Toric Eisenbud–Goto conjecture. Both inequalities should hold:

maxdegXdegX,\operatorname{maxdeg} X\leq\deg X, regXdegXcodimX+1.\operatorname{reg} X\leq\deg X-\operatorname{codim} X+1.

The first is called the weak inequality and the second the strong inequality. The paper states that the Eisenbud–Goto conjecture is widely believed for projective toric varieties, while even the weak form remains open.

Sources & referencesView supporting material

Primary source

Jong In Han and Sijong Kwak, “Surface counterexamples to the Eisenbud-Goto conjecture”, arXiv:2210.07174 (2025).

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