关于二次映射有理预周期点的Poonen猜想
On Poonen's Conjecture Concerning Rational Preperiodic Points of Quadratic Maps
摘要：
本文的目的是给出Poonen，Morton和Silverman关于二次多项式迭代下有理数的周期的证明.特别是，Poonen指出，有最多9个周期点定义的有理数的任何地图的家庭x^2 + c的c合理。我们在c值高达10^8的情况下验证了这一猜想。对于二次数域，我们证明了Q-有理数周期点的精确周期上界为6。
英文摘要：
The purpose of this note is give some evidence in support of conjectures of Poonen, and Morton and Silverman, on the periods of rational numbers under the iteration of quadratic polynomials. In particular, Poonen conjectured that there are at most 9 periodic points defined over the rational numbers for any map in the family x^2 + c for c rational. We verify this conjecture for c values up to height 10^8. For quadratic number fields, we provide evidence that the upper bound on the exact period of Q-rational periodic point is 6.
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