Syzygy conjecture for general projections of canonical curves

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Let C↪Pg−1C\hookrightarrow\mathbb{P}^{g-1} be a generic canonical curve of genus g≥9g\geq 9, and let p∈Pg−1p\in\mathbb{P}^{g-1} be a generic point. Write C′C' for the projection of CC away from pp to a hyperplane, and let b~t,1\widetilde{b}_{t,1} denote the graded Betti numbers of its syzygy resolution. Then the canonical projection conjecture. The curve C′C' has the following properties: (1) it satisfies N~Cliff⁡(C)−3\widetilde{N}_{\operatorname{Cliff}(C)-3}; (2) the length of the linear strands of its syzygy resolution is g−Cliff⁡(C)−3g-\operatorname{Cliff}(C)-3, meaning that b~t,1=0\widetilde{b}_{t,1}=0 if and only if 1≤t≤g−Cliff⁡(C)−31\leq t\leq g-\operatorname{Cliff}(C)-3; and (3) if g=2kg=2k, then b~k−2,1=b~k−3,2=1\widetilde{b}_{k-2,1}=\widetilde{b}_{k-3,2}=1, with the extra syzygy having maximal rank. These predictions refine the expected syzygies of general projections and remain conjectural in the stated generality.

References

Primary source

Li Li, “Syzygies of general projections of canonical and paracanonical curves”, arXiv:2407.08492 (2024).

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