热带超椭圆曲线的Jacobian加法
Addition in Jacobians of tropical hyperelliptic curves
摘要：
利用热带形式的Riemann-Roch定理证明了亏格为$g$的热带曲线上的$g$次有效因子集到其Jacobian的满射.然后，我们表明，满射的限制减少到双射的一个适当的子集上的一组有效因子的程度$g$的曲线。因此，有效因子子集具有由雅可比矩阵导出的加性群结构。通过与$3g/2$次或$3(g-1)/2$次热带曲线的交，实现了亏格为$g$的热带超椭圆曲线在Jacobian中的加法.
英文摘要：
We show that there exists a surjection from the set of effective divisors of degree $g$ on a tropical curve of genus $g$ to its Jacobian by using a tropical version of the Riemann-Roch theorem. We then show that the restriction of the surjection is reduced to the bijection on an appropriate subset of the set of effective divisors of degree $g$ on the curve. Thus the subset of effective divisors has the additive group structure induced from the Jacobian. We finally realize the addition in Jacobian of a tropical hyperelliptic curve of genus $g$ via the intersection with a tropical curve of degree $3g/2$ or $3(g-1)/2$.
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