Mistretta–Stoppino gonality-bound conjecture for non-complete linear series

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Let CC be an irreducible projective smooth complex curve, let LL be a line bundle on CC, and let V⊆H0(C,L)V\subseteq H^0(C,L) define a base point free non-complete linear series. Let MV,LM_{V,L} be its dual span bundle, defined by

0⟶MV,L⟶V⊗OC⟶L⟶0.0\longrightarrow M_{V,L}\longrightarrow V\otimes\mathcal O_C\longrightarrow L\longrightarrow 0.

Let γ\gamma denote the gonality of CC. Mistretta–Stoppino's gonality-bound conjecture. If

deg⁡(L)≤γ(dim⁡(V)−1),\deg(L)\leq\gamma\bigl(\dim(V)-1\bigr),

then linear (semi)stability of (L,V)(L,V) is equivalent to (semi)stability of MV,LM_{V,L}.

This conjecture is formulated after counterexamples above the gonality bound. The source gives no resolution status.

References

Primary source

Abel Castorena, George H. Hitching and Erick Luna, “Linear stability of coherent systems and applications to Butler's conjecture”, arXiv:2312.09309 (2023).

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