The modified-weight characterization of kappa-hyperelliptic semigroups

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Let S\mathrm{S} be a numerical semigroup of genus gg, let κ\kappa be a positive integer, and let WKW_{\mathrm{K}} denote its modified weight. A semigroup is κ\kappa-hyperelliptic in the sense used above.

Modified-weight characterization. Whenever g≫κg \gg \kappa, S\mathrm{S} is κ\kappa-hyperelliptic if and only if

(g−2κ2)+2κ≤WK≤(g−2κ2)+2κ2.{g-2\kappa \choose 2}+2\kappa \leq W_{\mathrm{K}} \leq {g-2\kappa \choose 2}+2\kappa^2.

This conjecture proposes an analogue of Torres' characteristic weight inequality with the modified weight WKW_{\mathrm{K}} replacing the ordinary weight WSW_{\mathrm{S}}. The preceding results establish the corresponding equality in the bielliptic case κ=1\kappa=1, while the general assertion is presented as a speculation and remains open.

References

Primary source

Ethan Cotterill, Lia Feital and Renato Vidal Martins, “Singular rational curves with points of nearly-maximal weight”, arXiv:1705.02658 (2017).

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