Bulletin of the
Korean Mathematical Society
BKMS
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Bull. Korean Math. Soc. 2017; 54(4): 1095~1470
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2017-07-31
The $t$-wise intersection of relative three-weight codes
Xin Li and Zihui LiuAbstract : The $t$-wise intersection is a useful property of a linear code due to its many applications. Recently, the second author determined the $t$-wise intersection of a relative two-weight code. By using this result and generalizing the finite projective geometry method, we will present the $t$-wise intersection of a relative three-weight code and its applications in this paper.
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2017-07-31
Cyclic and constacyclic self-dual codes over $R_k$
Suat Karadeniz, Ismail Gokhan Kelebek, and Bahattin YildizAbstract : In this work, we consider constacyclic and cyclic self-dual codes over the rings $R_k$. We start with theoretical existence results for constacyclic and cyclic self-dual codes of any length over $R_k$ and then construct cyclic self-dual codes over $R_1 = \F_2+u\F_2$ of even lengths from lifts of binary cyclic self-dual codes. We classify all free cyclic self-dual codes over $R_1$ of even lengths for which non-trivial such codes exist. In particular we demonstrate that our constructions provide a counter example to a claim made by Batoul et al. in \cite{Batoul} and we explain why their claim fails.
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2017-07-31
Ring structures concerning factorization modulo radicals
Hai-Lan Jin, Hong Kee Kim, and Yang LeeAbstract : The aim in this note is to describe some classes of rings in relation to factorization by prime radical, upper nilradical, and Jacobson radical. We introduce the concepts of {\it tpr} ring, {\it tunr} ring, and {\it tjr} ring in the process, respectively. Their ring theoretical structures are investigated in relation to various sorts of factor rings and extensions. We also study the structure of noncommutative tpr (tunr, tjr) rings of minimal order, which can be a base of constructing examples of various ring structures. Various sorts of structures of known examples are studied in relation with the topics of this note.
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2017-07-31
Distribution of the values of the derivative of the Dirichlet $L$-functions at its $a$-points
Mohamed Ta\"ib Jakhlouti and Kamel MazhoudaAbstract : In this paper, we study the value distribution of the derivative of a Dirichlet $L$-function $L'(s,\chi)$ at the $a$-points $\rho_{a,\chi}=\beta_{a,\chi}+i\gamma_{a,\chi}$ of $L(s,\chi).$ We give an asymptotic formula for the sum $$\sum_{\rho_{a,\chi};\ 0
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2017-07-31
Two meromorphic functions sharing four pairs of small functions
Van An Nguyen and Duc Quang SiAbstract : The purpose of this paper is twofold. The first is to show that two meromorphic functions $f$ and $g$ must be linked by a quasi-M\"{o}bius transformation if they share a pair of small functions regardless of multiplicity and share other three pairs of small functions with multiplicities truncated to level 4. We also show a quasi-M\"{o}bius transformation between two meromorphic functions if they share four pairs of small functions with multiplicities truncated by $4$, where all zeros with multiplicities at least $k> 865$ are omitted. Moreover the explicit M\"{o}bius-transformation between such $f$ and $g$ is given. Our results are improvement of some recent results.
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2017-07-31
Sufficient condition for the differentiability of the Riesz-N{\'a}gy-Tak{\'a}cs singular function
In-Soo BaekAbstract : We give some sufficient conditions for the null and infinite derivatives of the Riesz-N{\'a}gy-Tak{\'a}cs (RNT) singular function. Using these conditions, we show that the Hausdorff dimension of the set of the infinite derivative points of the RNT singular function coincides with its packing dimension which is positive and less than 1 while the Hausdorff dimension of the non-differentiability set of the RNT singular function does not coincide with its packing dimension 1.
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2017-07-31
Revisit nonlinear differential equations associated with Eulerian polynomials
Dae San Kim and Taekyun KimAbstract : In this paper, we present nonlinear differential equations arising from the generating function of the Eulerian polynomials. In addition, we give explicit formulae for the Eulerian polynomials which are derived from our nonlinear differential equations.
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2017-07-31
A random dispersion Schr\"{o}dinger equation with nonlinear time-dependent loss/gain
Hui Jian and Bin LiuAbstract : In this paper, the limit behavior of solution for the Schr\"{o}d\-inger equation with random dispersion and time-dependent nonlinear loss/gain: $idu + \frac{1}{\varepsilon} m(\frac{t}{\varepsilon^2})\partial_{xx}udt + |u|^{2\sigma}u dt + i\varepsilon a(t)|u|^{2\sigma_{0}}udt = 0$ is studied. Combining stochastic Strichartz-type estimates with $L^2$ norm estimates, we first derive the global existence for $L^2$ and $H^1$ solution of the stochastic Schr\"{o}dinger equation with white noise dispersion and time-dependent loss/gain:~$idu + \Delta{u} \circ d\beta + |u|^{2\sigma}u dt + ia(t)|u|^{2\sigma_{0}}udt = 0$. Secondly, we prove rigorously the global diffusion-approximation limit of the solution for the former as $\varepsilon\rightarrow0$ in one-dimensional $L^2$ subcritical and critical cases.
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2017-07-31
Reducing subspaces for a class of Toeplitz operators on weighted Hardy spaces over bidisk
Shuhei KuwaharaAbstract : We consider weighted Hardy spaces on bidisk ${\mathbb D}^2$ which generalize the weighted Bergman spaces $A_\alpha^2({\mathbb D}^2)$. Let $z,w$ be coordinate functions and $T_{\overline{z}^Nw}$ Toeplitz operator with symbol $\overline{z}^Nw$. In this paper, we study the reducing subspaces of $T_{\overline{z}^Nw}$ on the weighted Hardy spaces.
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2017-07-31
Abstract harmonic analysis over spaces of complex measures on homogeneous spaces of compact groups
Arash Ghaani FarashahiAbstract : This paper presents a systematic study of the abstract harmonic analysis over spaces of complex measures on homogeneous spaces of compact groups. Let $G$ be a compact group and $H$ be a closed subgroup of $G$. Then we study abstract harmonic analysis of complex measures over the left coset space $G/H$.
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