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Division by $1 - \zeta$ on superelliptic curves and jacobians. (arXiv:1810.07299v1 [math.AG])

In 2016, Yuri Zarhin gave formulas for "dividing a point on a hyperelliptic curve by 2." Given a point $P$ on a hyperelliptic curve $\mathcal{C}$, Zarhin gives the Mumford's representation of every degree $g$ divisor $D$ such that $2(D - g \infty) \sim P - \infty$. The aim of this paper is to generalize Zarhin's result to the superelliptic situation; instead of dividing by 2, we divide by $1 - \zeta$. Even though there is no Mumford's representation for superelliptic curves, we give a formula for functions which cut out $D$.查看全文

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