ترغب بنشر مسار تعليمي؟ اضغط هنا

An upper bound for Davenport constant of finite groups

152   0   0.0 ( 0 )
 نشر من قبل Weidong Gao
 تاريخ النشر 2013
  مجال البحث
والبحث باللغة English




اسأل ChatGPT حول البحث

Let $G$ be a finite (not necessarily abelian) group and let $p=p(G)$ be the smallest prime number dividing $|G|$. We prove that $d(G)leq frac{|G|}{p}+9p^2-10p$, where $d(G)$ denotes the small Davenport constant of $G$ which is defined as the maximal integer $ell$ such that there is a sequence over $G$ of length $ell$ contains no nonempty one-product subsequence.

قيم البحث

اقرأ أيضاً

298 - Yichao Tian 2010
Let $cO_K$ be a complete discrete valuation ring of residue characteristic $p>0$, and $G$ be a finite flat group scheme over $cO_K$ of order a power of $p$. We prove in this paper that the Abbes-Saito filtration of $G$ is bounded by a simple linear f unction of the degree of $G$. Assume $cO_K$ has generic characteristic 0 and the residue field of $cO_K$ is perfect. Fargues constructed the higher level canonical subgroups for a Barsotti-Tate group $cG$ over $cO_K$ which is not too supersingular. As an application of our bound, we prove that the canonical subgroup of $cG$ of level $ngeq 2$ constructed by Fargues appears in the Abbes-Saito filtration of the $p^n$-torsion subgroup of $cG$.
Let $D subset mathbb{R}^d$ be a bounded, connected domain with smooth boundary and let $-Delta u = mu_1 u$ be the first nontrivial eigenfunction of the Laplace operator with Neumann boundary conditions. We prove $$ |u|_{L^{infty}(D)} leq 60 cdot |u|_ {L^{infty}(partial D)}.$$ This shows that the Hot Spots Conjecture cannot fail by an arbitrary factor. An example of Kleefeld shows that the optimal constant is at least $1 + 10^{-3}$.
108 - Dihua Jiang , Baiying Liu 2021
We prove a conjecture of the first-named author ([J14]) on the upper bound Fourier coefficients of automorphic forms in Arthur packets of split classical groups over any number field.
Let $G$ be a finite abelian group of exponent $n$, written additively, and let $A$ be a subset of $mathbb{Z}$. The constant $s_A(G)$ is defined as the smallest integer $ell$ such that any sequence over $G$ of length at least $ell$ has an $A$-weighted zero-sum of length $n$ and $eta_A(G)$ defined as the smallest integer $ell$ such that any sequence over $G$ of length at least $ell$ has an $A$-weighted zero-sum of length at most $n$. Here we prove that, for $alpha geq beta$, and $A=left{xinmathbb{N}; : ; 1 le a le p^{alpha} ; mbox{ and }; gcd(a, p) = 1right }$, we have $s_{A}(mathbb{Z}_{p^{alpha}}oplus mathbb{Z}_{p^beta}) = eta_A(mathbb{Z}_{p^{alpha}}oplus mathbb{Z}_{p^beta}) + p^{alpha}-1 = p^{alpha} + alpha +beta$ and classify all the extremal $A$-weighted zero-sum free sequences.
For a finite group $G$, let $mathrm{diam}(G)$ denote the maximum diameter of a connected Cayley graph of $G$. A well-known conjecture of Babai states that $mathrm{diam}(G)$ is bounded by ${(log_{2} |G|)}^{O(1)}$ in case $G$ is a non-abelian finite si mple group. Let $G$ be a finite simple group of Lie type of Lie rank $n$ over the field $F_{q}$. Babais conjecture has been verified in case $n$ is bounded, but it is wide open in case $n$ is unbounded. Recently, Biswas and Yang proved that $mathrm{diam}(G)$ is bounded by $q^{O( n {(log_{2}n + log_{2}q)}^{3})}$. We show that in fact $mathrm{diam}(G) < q^{O(n {(log_{2}n)}^{2})}$ holds. Note that our bound is significantly smaller than the order of $G$ for $n$ large, even if $q$ is large. As an application, we show that more generally $mathrm{diam}(H) < q^{O( n {(log_{2}n)}^{2})}$ holds for any subgroup $H$ of $mathrm{GL}(V)$, where $V$ is a vector space of dimension $n$ defined over the field $F_q$.
التعليقات
جاري جلب التعليقات جاري جلب التعليقات
سجل دخول لتتمكن من متابعة معايير البحث التي قمت باختيارها
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا