Dzmitry Badziahin

  1. The mixed Schmidt conjecture in the theory of Diophantine approximation.

    Authors: Sanju Velani, Jason Levesley, Dzmitry Badziahin
    Subjects: Number Theory
    Abstract

    Let $\mathcal{D}=(d_n)_{n=1}^\infty$ be a bounded sequence of integers with
    $d_n\ge 2$ and let $(i, j)$ be a pair of strictly positive numbers with
    $i+j=1$. We prove that the set of $x \in \RR$ for which there exists some
    constant $c(x) > 0$ such that \[ \max\{|q|_\DDD^{1/i}, \|qx\|^{1/j}\} > c(x)/ q
    \qquad \forall q \in \NN \] is one quarter winning (in the sense of Schmidt
    games). Thus the intersection of any countable number of such sets is of full
    dimension.

  2. On a problem in simultaneous Diophantine approximation: Schmidt's conjecture.

    Authors: Sanju Velani, Dzmitry Badziahin, Andrew Pollington
    Subjects: Number Theory
    Abstract

    For any $i,j \ge 0$ with $i+j =1$, let $\bad(i,j)$ denote the set of points
    $(x,y) \in \R^2$ for which $ \max \{\|qx\|^{1/i}, \|qy\|^{1/j} \} > c/q $ for
    all $ q \in \N $. Here $c = c(x,y)$ is a positive constant. Our main result
    implies that any finite intersection of such sets has full dimension. This
    settles a conjecture of Wolfgang M. Schmidt in the theory of simultaneous
    Diophantine approximation.

RSS-материал