中文

与通用 Drinfeld 模相关的 Galois 群及 Abhyankar 猜想

数论 2015-08-20 v3

摘要

ϕ\phi 为由 ϕT(X)=TX+g1Xq+...+gr1Xqr1+Xqr\phi_T(X) = TX+g_1X^q+...+g_{r-1}X^{q^{r-1}}+X^{q^r} 确定的秩 rr Drinfeld \BFq[T]\BF_q[T]-模,其中 g1,...,gr1g_1,...,g_{r-1}\BFq(T)\BF_q(T) 上代数独立。设 N\BFq[T]N\in\BF_q[T] 为一个多项式,k/\BFqk/\BF_q 为一个代数扩张。我们证明了 ϕN(X)\phi_N(X)k(T,g1,...,gr1)k(T,g_1,...,g_{r-1}) 上的 Galois 群同构于 \GLr(\BFq[T]/N\BFq[T])\GL_r(\BF_q[T]/N\BF_q[T]),从而解决了 Abhyankar 的一个猜想。

关键词

引用

@article{arxiv.1303.2334,
  title  = {Galois groups associated to generic Drinfeld modules and a conjecture of Abhyankar},
  author = {Florian Breuer},
  journal= {arXiv preprint arXiv:1303.2334},
  year   = {2015}
}

备注

Notice of replacement: The previous version contains a fatal flaw, briefly explained here. This article is now replaced by the longer paper arXiv:1503.06420 [math.NT], where the flaw is corrected