http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 발행기관 : 대한수학회 (검색결과 4,973 건)
- 무료
- 기관 내 무료
- 유료
-
Mahsa Fatehi,Mahmood Haji Shaabani 대한수학회 2017 대한수학회지 Vol.54 No.2
If $\psi$ is analytic on the open unit disk $\mathbb{D}$ and $\varphi$ is an analytic self-map of $\mathbb{D}$, the weighted composition operator $C_{\psi,\varphi}$ is defined by $C_{\psi,\varphi}f(z)=\psi(z)f (\varphi (z))$, when $f$ is analytic on $\mathbb{D}$. In this paper, we study normal, cohyponormal, hyponormal and normaloid weighted composition operators on the Hardy and weighted Bergman spaces. First, for some weighted Hardy spaces $H^{2}(\beta)$, we prove that if $C_{\psi,\varphi}$ is cohyponormal on $H^{2}(\beta)$, then $\psi$ never vanishes on $\mathbb{D}$ and $\varphi$ is univalent, when $\psi \not \equiv 0$ and $\varphi$ is not a constant function. Moreover, for $\psi=K_{a}$, where $|a| < 1$, we investigate normal, cohyponormal and hyponormal weighted composition operators $C_{\psi,\varphi}$. After that, for $\varphi $ which is a hyperbolic or parabolic automorphism, we characterize all normal weighted composition operators $C_{\psi,\varphi}$, when $\psi \not \equiv 0$ and $\psi$ is analytic on $\overline{\mathbb{D}}$. Finally, we find all normal weighted composition operators which are bounded below.
-
On a subclass of certain convex harmonic functions
S\.{i}bel Yal\c{c}in,Met\.in \ 대한수학회 2006 대한수학회지 Vol.43 No.4
We define and investigate a subclass of complex valued harmonicconvex functions that are univalent and sense preserving in theopen unit disk. We obtain coefficient conditions, extreme points,distortion bounds, convolution conditions for the above family of
-
Non-triviality of two homotopy elements in $\pi_{\ast}S$
Xiugui Liu 대한수학회 2006 대한수학회지 Vol.43 No.4
Let A be the mod p Steenrod algebra for p an arbitrary oddprime and S the sphere spectrum localized at p. In this paper,some useful propositions about the May spectral sequence are firstgiven, and then, two new nontrivial homotopy elements alpha_1jxi_n (pgeq 5,ngeq 3) and gamma_salpha_1 jxi_n(pgeq 7, ngeq 4) are detected in the stable homotopy groupsof spheres, where xi_nin pi_{p^nq+pq-2}M is obtained in [2].The new ones are of degree 2(p-1)(p^n+p+1)-4 and2(p-1)(p^n+sp^2+sp+(s-1))-7 and are represented up to nonzeroscalar by b_0h_0h_n, b_0 h_0 h_n tilde{gamma}_{s}not=0inoperatorname{Ext}_A^{ast,ast}(Z_p,Z_p) in the Adams spectralsequence respectively, where 3leq s<p-2.
-
Slant Submanifolds of an Almost Product Riemannian Manifold
Bayram Sahin 대한수학회 2006 대한수학회지 Vol.43 No.4
In this paper, we study both slant and semi-slant submanifolds ofan almost product Riemannian manifold. We give characterizationtheorems for slant and semi-slant submanifolds and investigatespecial class of slant submanifolds which are product version ofKaehlerian slant submanifold. We also obtain integrabilityconditions for the distributions which are involved in thedefinition of a semi-slant submanifold. Finally, we prove atheorem on the geometry of leaves of distributions under acondition.
-
-
Weakly $(m,n)$-closed ideals and $(m,n)$-von Neumann regular rings
David F. Anderson,Ayman Badawi,Brahim Fahid 대한수학회 2018 대한수학회지 Vol.55 No.5
Let $R$ be a commutative ring with $ 1 \neq 0$, $I$ a proper ideal of $R$, and $m$ and $n$ positive integers. In this paper, we define $I$ to be a weakly $(m,n)$-closed ideal if $ 0\neq x^{m}\in I$ for $x \in R$ implies $x^{n} \in I$, and $R$ to be an $(m,n)$-von Neumann regular ring if for every $x \in R$, there is an $r \in R$ such that $x^mr = x^n$. A number of results concerning weakly $(m, n)$-closed ideals and $(m,n)$-von Neumann regular rings are given.
-
-
Nuclearity properties and C*-envelopes of operator system inductive limits
Ajay Kumar,Preeti Luthra 대한수학회 2018 대한수학회지 Vol.55 No.5
We investigate the relationship between $C^*$-envelopes and inductive limit of operator systems. Various operator system nuclearity properties of inductive limit for a sequence of operator systems are also discussed.
-
-
이승원,고성은 대한수학회 1998 대한수학회논문집 Vol.13 No.3
쌍곡공간$^3$에 들어있는 닫힌 곡면의 주곡률함수가 특별한 함수 관계를 만족시킨다면 그 곡면은 둥근공임을 보였다. 이 결과를 이용하여 Gauss-Kronecker 곡률이 상수인 닫힌 곡면은 둥근공 뿐이 없음도 보였다.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
