arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0808.2679math.NTmath.DS
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后向轨道中的点

Integer Points in Backward Orbits

Vijay A. Sookdeo

摘要:

J. Silverman的一个定理指出,当$(ϕ\circϕ)(z)$不是多项式时,$\mathbb P^1(K)$上的有理映射$ϕ(z)$的前向轨道在数域$K$中包含3个$S$ -整数。我们陈述一个类似的猜想向后轨道使用一般的$S$ -积分概念的基础上的伽罗瓦共轭点。当$β\not =0$是非单位根时,通过一致地限定$z^n-β$的伽罗瓦轨道数,证明了这个猜想对映射$ϕ(z)=z^d$,进而对切比雪夫多项式是有效的.一般来说,只要$ϕ^n(z)-β$的伽罗瓦轨道数独立于$n$有界,我们的猜想是成立的.

英文摘要:

A theorem of J. Silverman states that a forward orbit of a rational map $ϕ(z)$ on $\mathbb P^1(K)$ contains finitely many $S$-integers in the number field $K$ when $(ϕ\circϕ)(z)$ is not a polynomial. We state an analogous conjecture for the backward orbits using a general $S$-integrality notion based on the Galois conjugates of points. This conjecture is proven for the map $ϕ(z)=z^d$, and consequently Chebyshev polynomials, by uniformly bounding the number of Galois orbits for $z^n-β$ when $β\not =0$ is a non-root of unity. In general, our conjecture is true provided that the number of Galois orbits for $ϕ^n(z)-β$ is bounded independently of $n$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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