Seminar in Number Theory 主講者: 陳慧錚博士 (中研院數學所) 講題: Approximation by algebraic elements of bounded degree in finite characteristic 時間: 2012-12-25 (Tue.)  10:00 - 地點: 數學所 617 研討室 (台大院區) Abstract: Wirsing conjectured ( generalization of Dirichlet's result ) that for any real number $\zeta$ and positive integer $n$, if $\zeta$ is not algebraic of degree at most $n$, then for any $\epsilon >0$, there exist infinitely many real algebraic numbers $\alpha$ with degree at most $n$ such that $| \zeta - \alpha | \leq \frac{C}{H(\alpha)^{n+1-\epsilon }},$ where $C$ is a constant depending only on $\zeta$, $n$ and $\epsilon$. Sprind\v{z}uk showed that the conjecture is true for almost all real numbers ( in the sense of Lebesgue measure). Baker and Schmidt studied sets $K_n(\lambda)$ that are defined more widely in terms of approximation by algebraic approximation of bounded degrees and established a generalization result of the Jarnik-Besicovitch theorem. In this talk we will give an analog of Baker and Schmidt's theorem in the fields of formal power series. || Close window ||