共查询到20条相似文献,搜索用时 78 毫秒
1.
本文将一类修正的Kdv方程ut+auux + au2ux +μux3+β(1+u2)(1+ux2)(1+ut2)(1+ux32)(ux3+σux 相似文献
2.
设X为一复域C上的Banach空间,设T:X→X为一有界线性算子,其指标为k且R(Tk)闭.记T的Drazin逆为TD.设T=T+δT,则在一定条件下,TD有简明分解式TD=TD(I+δTTD)-1=(I+TDδT)-1TD,从而导出了相对误差‖TD-TD< 相似文献
3.
设Hp(Rn)(00一致有界的乘子族,那么m为Hp(Tn)乘子。并且由此得到了Hp(Tn)乘子在低维空间上的限制性定理。 相似文献
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用胆酸盐透析法将猪心线粒体H+-ATP酶在脂质体重组过程中,1mM Mg2+能显著提高重组酶的活性(32P1-ATP交换,酶水解活力及其对寡霉素、二环己基碳二亚胺DCCD的敏感性和ANS荧光变化),而且重复性较好.除Mg2+外,对其它二价金属离子和精脒计影响重组的作用也进行了比较。对32Pi-ATP交换活性的影响大小为Mga+>Ca2+>Mn2+>sra+;对抑制剂敏感性的影响程度为Ca2+>Mg2+>Mn2+>Sr2+.cd2+,Zn2+和精脒3+对重组酶的二种活性均无明显影响.对金属离子影响重组H+-ATP酶活性的机理也进行了讨论. 相似文献
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Thomas Nordahl 《Semigroup Forum》1974,8(1):332-346
In this paper we characterize Archimedean semigroups with idempotents satisfying (xy)m = xmym as exactly those semigroups which are a retract extension of a completely simple semigroup satisfying (xy)m = xmym by a nil semigroup satisfying (xy)m = xmym. Regular semigroups satisfying (xy)2 = x2y2 are exactly those semigroups which are a spined product of a band and a semigroup which is a semilattice of Abelian groups. A semigroup which is a nil extension of a regular semigroup satisfies (xy)2 = x2y2 if and only if it is a retract extension of a regular semigroup satisfying (xy)2 = x2y2 by a nil semigroup satisfying (xy)2 = x2y2 相似文献
12.
A cyclic coloring of a plane graph is a vertex coloring such that vertices incident with the same face have distinct colors. The minimum number of colors in a cyclic coloring of a graph is its cyclic chromatic number χc. Let Δ* be the maximum face degree of a graph. There exist plane graphs with χc = ?3/2 Δ*?. Ore and Plummer [ 5 ] proved that χc ≤ 2, Δ*, which bound was improved to ?9/5, Δ*? by Borodin, Sanders, and Zhao [ 1 ], and to ?5/3,Δ*? by Sanders and Zhao [ 7 ]. We introduce a new parameter k*, which is the maximum number of vertices that two faces of a graph can have in common, and prove that χc ≤ max {Δ* + 3,k* + 2, Δ* + 14, 3, k* + 6, 18}, and if Δ* ≥ 4 and k* ≥ 4, then χc ≤ Δ* + 3,k* + 2. © 2006 Wiley Periodicals, Inc. J Graph Theory 相似文献
13.
设R是有单位元1的结合环,(S,≤)是严格全序Artin幺半群,M_R是右R-模,Att(M_R)与Att([M~(S,≤)]_([[R~(S,≤)]]))分别表示模M_R与广义逆多项式模[M~(S,≤)]_([[R~(S,≤)]])的所有Attached素理想组成的集合.该文主要讨论了广义幂级数环[[R~(S;≤)]]广义逆多项式模[[R~(S;≤)]]的Attached素理想的相关性质,证明了在一定条件下,有Att([M~(S,≤)]_([[R~(S,≤)]])={[[PR~(S;≤)]]P∈Att(M_R)}.这一结论表明广义逆多项式模([M~(S,≤)]_([[R~(S,≤)]])的Attached素理想在一定条件下可以用模M_R的Attached素理想来刻画,推广了Annin S在文献[1]中关于斜多项式环上逆多项式模的Attached素理想的相关结论. 相似文献
14.
James E. Baumgartner 《Israel Journal of Mathematics》1975,21(4):296-307
Partition relations of the form α→(α,m)2, where α is an ordinal andm is a positive integer, are considered. Let κ be a cardinal. The following are proved: If κ is singular and 2K=K + then (K+)2?((K+)2,3)2. If κ is a strong limit cardinal, then2, iff ((cfκ)2→((cfκ)2,m)2. If κ is regular and K2→(K2,3)2, then the κ-Souslin hypothesis holds. If Kω<α+ and cfα=cfκ>ω, then α?(α,3)2. 相似文献
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We discuss the representation theory of both the locally convex and non-locally convex topological*-algebras. First we discuss the*-representation of topological*-algebras by operators on a Hilbert space. Then we study those topological*-algebras so that every*-representation of which on a Hilbert space is necessarily continuous. It is well-known that each*-representation of aB
*-algebra on a Hilbert space is continuous. We show that this is true for a large class of*-algebras more general thanB
*-algebras, including certain non-locally convex*-algebras. Finally, we investigate the conditions under which a positive functional on a topological*-algebra is representable.The research of the first-named author was partially supported by an NSERC grant. This work was done by the second-named author when he was a post-doctoral fellow at McMaster University. 相似文献
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By an (abstract) Kummer variety Kd we mean the d-dimensiona1 torus Td modulo the involution ? ? — ?. The 2d elements in Td of order two are fixed points of the involution and therefore Kd has 2d isolated singularities (for d ≧ 3). Any simplicial decomposition of Kd must have at least as many vertices. In this paper we describe a highly symmetrical simplicial decomposition of Kd with 2d vertices such that the link of each vertex is a combinatorial real projective space ?Pd-1 with 2d—1 vertices. The automorphism group of order (d + 1)! 2d admits a natural representation in the affine group of dimension d over the field with two elements. A particular case is the classical Kummer surface with 16 nodes (d=4). In this case our 16-vertex triangulation has a close relationship with the abstract Kummer configuration 166. 相似文献
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We describe a partition of the double flag variety G/B+ × G/B- of a complex semisimple algebraic group G analogous to the Deodhar partition on the flag variety G/B+. This partition is a refinement of the stratification into orbits both for B+ × B- and for the diagonal action of G, just as Deodhar's partition refines the orbits of B+ and B-. We give a coordinate system on each stratum, and show that all strata are coisotropic subvarieties. Also, we discuss possible
connections to the positive and cluster geometry of G/B+ × G/B-, which would generalize results of Fomin and Zelevinsky on double Bruhat cells and Marsh and Rietsch on double Schubert cells. 相似文献
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Joachim Bauer 《manuscripta mathematica》1972,6(4):359-363
In this note we shall prove the following statements: Let Mn, n>3, be a compact, triangulated, n-dimensional mainfold with H2(Mn)=0; let f: MnS3 be an essential map onto the 3-sphere, Then there exist at most two points a and b, so that f–1(a) and f–1(b) are finite sets. If f: M4S3 is essential, then there are at most two points a and b with dim f–1(a)=0 and dim f–1(b)=0. 相似文献
19.
The Picard variety Pic0(?
n
) of a complex n-dimensional torus?
n
is the group of all holomorphic equivalence classes of topologically trivial holomorphic (principal) line bundles on ?
n
. The total space of a topologically trivial holomorphic (principal) line bundle on a compact K?hler manifold is weakly pseudoconvex.
Thus we can regard Pic0(?
n
) as a family of weakly pseudoconvex K?hler manifolds. We consider a problem whether the Kodaira's -Lemma holds on a total space of holomorphic line bundle belonging to Pic0(?
n
). We get a criterion for this problem using a dynamical system of translations on Pic0(?
n
). We also discuss the problem whether the -Lemma holds on
strongly pseudoconvex K?hler manifolds or not. Using the result of ColColţoiu, we find a 1-convex complete K?hler manifold
on which the -Lemma does not hold.
Received: 11 June 1999 / Revised version: 22 November 1999 相似文献
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Tatsuya Yamashita 《代数通讯》2013,41(11):4811-4822
The main purpose of this paper is to provide several results on objects lying between differential geometry and algebraic geometry such as C∞-rings and derivations on a C∞-ring. A C∞-ring is defined as a set with operations by C∞-functions on Euclidean spaces. A derivation on a C∞-ring is defined in two method, an ?-derivation and a C∞-derivation. The main result of this paper is to show that any ?-derivation is a C∞-derivation for some classes of C∞-rings (Theorems 3.1, 3.2). 相似文献