中文

一维超吸引芽的Böttcher坐标的整数性性质

动力系统 2017-10-04 v2 数论

摘要

RR为特征00的环,其分式域为KK,并设m2m\ge2。幂级数φ(x)xm+xm+1R[ ⁣[x] ⁣]\varphi(x)\in x^m + x^{m+1}R[\![x]\!]的Böttcher坐标为满足φfφ(x)=fφ(xm)\varphi\circ f_\varphi(x) = f_\varphi(x^m)的唯一幂级数fφ(x)x+x2K[ ⁣[x] ⁣]f_\varphi(x)\in x+x^2K[\![x]\!]。本文研究fφ(x)f_\varphi(x)系数整数性性质,部分出于其内在兴趣,部分出于在pp进动力系统中的潜在应用。结果包括:(1) 若pp为素数且R=ZpR=\mathbb Z_pφ(x)xp+pxp+1R[ ⁣[x] ⁣]\varphi(x)\in x^p + px^{p+1}R[\![x]\!],则fφ(x)R[ ⁣[x] ⁣]f_\varphi(x)\in R[\![x]\!]。(2) 若φ(x)xm+mxm+1R[ ⁣[x] ⁣]\varphi(x)\in x^m + mx^{m+1}R[\![x]\!],则fφ(x)=xk=0akxk/k!f_\varphi(x)=x\sum_{k=0}^\infty a_kx^k/k!且所有akRa_k\in R。(3) 在(2)中,若m=p2m=p^2,则对所有为pp的幂的kk,有ak1(modp)a_k\equiv-1\pmod{p}

关键词

引用

@article{arxiv.1708.09275,
  title  = {Integrality properties of B\"ottcher coordinates for one-dimensional superattracting germs},
  author = {Adriana Salerno and Joseph H. Silverman},
  journal= {arXiv preprint arXiv:1708.09275},
  year   = {2017}
}

备注

27 pages. Version 2 fixes the statement and proof of Theorem 4