搜索结果: 121-135 共查到“数学 Existence”相关记录182条 . 查询时间(0.062 秒)
On a New Result on the Existence of Zeros due to Ricceri
Zeros dual space Ricceri arbitrary topological spaces
2009/1/22
The purpose of this short paper is to extend a recent result of Ricceri, on the existence of zeros of functions with values in a dual space, to the existence of solutions to inclusions with values in ...
Existence and Uniqueness of Solution of Unilateral Problems with $L^{1}$ Data
Uniqueness of Solution $L^{1}$ Data Unilateral Problems
2009/1/20
We prove an existence and uniqueness theorem for the solution of unilateral problems with $L^{1}$ data.
Existence of a Continuous Solution of Parametric Nonlinear Equation with Constraints
Continuous Solution Parametric Nonlinear Equation Constraints
2009/1/16
Combining a consequence of the Michael continuous selection theorem and an iterative scheme we prove the existence of a continuous solution of a parametric equation with constraints. An inverse functi...
Euler-Lagrange Inclusions and Existence of Minimizers for a Class of Non-Coercive Variational Problems
Calculus of variations existence Euler-Lagrange inclusions radially symmetric solutions non-coercive problems
2009/1/13
We are concerned with integral functionals of the form
J(v)\doteq \int_{B_R^n} \left[f(|x|,|\nabla v(x)|)+h(|x|,v(x))\right] dx,
defined on $W^{1,1}_0(B_R^n, \mathbb{R}^m)$, where $B_R^n$ is the b...
Existence and regularity of optimal solution for a dead oil isotherm problem
optimal control dead oil isotherm model existence regularity
2009/1/6
We study a system of nonlinear partial di®erential equations
resulting from the traditional modelling of oil engineering within the frame-
work of the mechanics of a continuous medium. Existence...
The existence of countably many positive solutions for a system of second order four-point boundary value problems with p-Laplacian operator
Positive solution Fixed point p-Laplacian
2010/9/14
The existence of countably many positive solutions for a system of second order four-point boundary value problems with p-Laplacian operator
Sufficient and necessary conditions for existence of positive solutions to p-Laplacian systems
p-Laplacian operator variational method sub and supersolutionfor the system
2010/9/10
In this work, we are concerned with the study of existence of positive solutions to some p-Laplacian systems on an unbounded domain, with non-linearities without a necessary variational character. Und...
On the existence of solutions of boundary value problems for a class of high order operator-differential equations
Hilbert space existence of generalized solution
2010/9/10
In the paper we give the sufficient conditions on the existence and uniqueness of generalized solutions a boundary value problems of one class of high order operator operator-differential equations at...
Existence and uniqueness of an entropy solution for Burgers equation
existence d uniqueness theorems approximation
2010/9/13
This paper is concerned with the proof of the existence and uniqueness of an entropy solution for B urgers equation with additive source term (outside forces act on fluid particles). Some estimates ar...
Existence of quadrature surfaces for uniform density supported by a segment
free boundary quadrature surfaces shape optimization optimality con-dition uniform density
2008/12/26
Given are two strictly positive constants a and k. We show
that if a ¸ 3:92k then there exists an open and bounded set in R2
which contains strictly the line segment C (C = [¡1; 1]...
Existence and uniqueness for optimal control of Oxygen absorption in aquatic system
Optimal control dissolve oxygen biological Oxygen demand water pollution
2008/12/26
In this paper, we consider the mathematical formulation and
analysis of an optimal control problem for a nonlinear Dissolve Oxy-
gen(DO)/ Biological Oxygen Demand(BOD) system with logistic growth
t...
EXISTENCE OF RADIAL SOLUTIONS FOR A FOURTH ORDER PARABOLIC EQUATION
Fourth order parabolic equation Radial solution Existence
2008/11/26
We consider an initial-boundary problem for a fourth order nonlinear parabolic equation.
The problem as a model arises in epitaxial growth of nanoscale thin films. Relying
on some necessary uniform ...
THE EXISTENCE AND NONEXISTENCE OF POSITIVE PERIODIC SOLUTIONS FOR NEUTRAL DELAY COMPETITION MODEL
Coincidence degree neutral functional differential equation positive periodic solution
2008/11/25
By using the theory of coincidence degree, sufficient conditions for the existence and
nonexistence of positive periodic solutions of a class of neutral delay competition model
are obtained.
Existence of Limit Cycles in a Predator-Prey System With a Functional Response of the Form Arctan(ax)
Predator prey system limit cycle unctional response
2008/11/25
We consider a predator prey system with the functional response of the form
µ(x) = arctan(ax); a > 0. The main concern in this paper is the existence of
limit cycles for such system. A necessa...
Existence and Global Attractivity of Periodic Solutions in $n$-Species Food-Chain System with Time Delays
Time delay Periodic solution Global attractivity
2008/7/1
A delayed periodic n-species simple food-chain system with Holling type-II functional response is investigated. By means of Gaines and Mawhin's continuation theorem of coincidence degree theory and by...