LOWER_BOUND

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OPERATOR NORM AND LOWER BOUND OF FOUR-DIMENSIONAL GENERALIZED HAUSDORFF MATRICES
《Acta Mathematica Scientia》2022年第1期429-436,共8页Gholamreza TALEBI 
The problem addressed is the exact determination of the operator norm and lower bound of four-dimensional generalized Hausdorff matrices on the double sequence spaces L_(p).A Hardy type formulae is found as an exact v...
关键词：four-dimensional HAUSDORFF MATRICES 
NEW LOWER BOUNDS FOR LEE DISCREPANCY ON TWO AND THREE MIXED LEVELS FACTORIALS被引量：3
《Acta Mathematica Scientia》2016年第6期1832-1840,共9页宋硕 张琼慧 邹娜 覃红 
supported by the National Natural Science Foundation of China(11301546).supported by the National Natural Science Foundation of China(11271147,11471136)
The objective of this paper is to study the issue of uniformity on asymmetrical designs with two and three mixed levels in terms of Lee discrepancy. Based on the known formulation, we present a new lower bound of Lee ...
关键词：U-type design Lee discrepancy uniform design lower bound 
LOWER BOUNDS OF BLOW UP TIME FOR A SYSTEM OF SEMI-LINEAR HYPERBOLIC PETROVSKY EQUATIONS被引量：2
《Acta Mathematica Scientia》2016年第3期683-688,共6页Amir PEYRAVI 
Li et al. in [3] obtained blow-up results for a system of Petrovskey equations in some different cases. In this article we obtain lower bounds for the blow up time under some considerations on initial data.
关键词：lower bound blow up Petrovsky systems 
ON THE LOWER BOUND FOR A CLASS OF HARMONIC FUNCTIONS IN THE HALF SPACE被引量：4
《Acta Mathematica Scientia》2012年第4期1487-1494,共8页张艳慧 邓冠铁 高洁欣 
Project supported by the Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality (IHLB201008257);Scientific Research Common Program of Beijing Municipal Commission of Education (KM200810011005);PHR (IHLB 201102);research grant of University of Macao MYRG142(Y1-L2)-FST111-KKI
The main objective is to derive a lower bound from an upper one for harmonic functions in the half space, which extends a result of B. Y. Levin from dimension 2 to dimension n 〉 2. To this end, we first generalize th...
关键词：harmonic function Carleman＇s formula Nevanlinna＇s representation for halfsphere lower bound 
ESTIMATES ON THE FINITE ELEMENT APPROXIMATIONS OF A QUADRATIC FUNCTIONAL
《Acta Mathematica Scientia》2012年第1期209-218,共10页Xiaqi Ding 
This paper gives some estimates of a quadratic functional related with Rie- mann Hypothesis.
关键词：quadratic functional estimate of lower bound finite element 
ON THE EXCEPTIONAL FIELDS FOR A CLASS OF REAL QUADRATIC FIELDS
《Acta Mathematica Scientia》2011年第3期1179-1188,共10页刘丽 陆洪文 
supported by the NSFC(10801105;30871444);the Key Project of Natural Science of Anhui Provincial Department of Education(KJ2009A44);the Doctoral Special Fund of Hefei University of Technology(GDBJ2010-012);the Key Project of Science and Technology of Anhui Province(08010302070)
In this paper, we give a lower bound exp（2.2 × 10~8 ） for those discriminants of real quadratic fields Q（√ d） with d= N^2-4 and h（d）=1.
关键词：quadratic field class number DISCRIMINANT ZETA-FUNCTION lower bound 
A LOWER BOUND OF STABLE STATIONARY TRAJECTORIES
《Acta Mathematica Scientia》2007年第3期535-540,共6页J.M. Soriano C. Ding 
This work is partially supported by D.G.Y.C.T.PB 96-1338-CO 2-01 and the Junta de Andalucía.
It is proven that an autonomous system verifying some conditions has at least one stable stationary trajectory and it is also given a lower bound to the number of unstable stationary trajectorlies.
关键词：Autonomous system continuation methods TRAJECTORY nondegenerate critical point zero point stationary trajectory stable trajectory asymptotically stable Morse inequalities 
AN INVERSE MAXIMUM CAPACITY PATH PROBLEM WITH LOWER BOUND CONSTRAINTS被引量：1
《Acta Mathematica Scientia》2002年第2期207-212,共6页杨超 陈学旗 
The authors gratefully acknowledge the partial support of national natural Founda-tion (Grant 70071011)
The computational complexity of inverse mimimum capacity path problem with lower bound on capacity of maximum capacity path is examined, and it is proved that solution of this problem is NP-complete. A strong polynomi...
关键词：Maximum capacity path computational complexity inverse problem polynomial algorithm 
LOWER BOUND NUMBER OF IRREDUCIBLE GRAPHS ON SURMCES
《Acta Mathematica Scientia》1998年第3期333-339,共7页刘莹 刘彦佩 
Irreducible graphs are those graphs which can hot be embedded on some surface but deleting ally edge of this graph, the resultant graph can be embedded on the surface. This paper characterizes one kind of irreducible ...
关键词：irreducible graph surface GENUS embedding. 
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