Results 21 to 30 of about 6,587,946 (287)

Existence‎ Solution for‎ ‎a Non-smooth System [PDF]

open access: yesMathematics Interdisciplinary Research
‎A variational method for a mixed boundary value problem in mathematical physics is considered‎. ‎Using two-field Lagrange multipliers‎, ‎we would investigate a variational formulation containing a mixed variational problem which is equivalent with a ...
Maisam Alizadeh   +2 more
doaj   +1 more source

A posteriori error covariances in variational data assimilation [PDF]

open access: yes, 2009
The problem of variational data assimilation for a nonlinear evolution model is formulated as an optimal control problem to find some unknown parameters of the model.
Le Dimet, F.X.   +5 more
core   +4 more sources

A New Iterative Method for Solving General Mixed Variational Inequalities [PDF]

open access: yes, 2008
The general mixed variational inequality containing a nonlinear term φ is a useful and an important generalization of variational inequalities. The projection method cannot be applied to solve this problem due to the presence of the nonlinear term. To
Shi, Chaofeng
core   +5 more sources

On a Volume-Constrained Variational Problem [PDF]

open access: yesArchive for Rational Mechanics and Analysis, 1999
Let \(W\colon {\mathbb R}^{d\times N}\to[0,+\infty[\) be a \(C^1\) quasiconvex function with \(p\) growth, \(p>1\), and such that \[ \sum_{i,j=1}^d\sum_{k=1}^N{\partial W\over\partial\xi_{ik}}(\xi)\xi_{jk}v^iv^j > 0\text{ whenever }\xi^Tv\not=0,\;\xi\in{\mathbb R}^{d\times N},\;v\in S^{d-1}, \] where \(S^{d-1}\) is the unit sphere in \({\mathbb R}^d\).
L. AMBROSIO   +3 more
openaire   +2 more sources

Multistep Hybrid Extragradient Method for Triple Hierarchical Variational Inequalities

open access: yesAbstract and Applied Analysis, 2013
We consider a triple hierarchical variational inequality problem (THVIP), that is, a variational inequality problem defined over the set of solutions of another variational inequality problem which is defined over the intersection of the fixed point set ...
Zhao-Rong Kong   +3 more
doaj   +1 more source

Variations on the Sum-Product Problem [PDF]

open access: yesSIAM Journal on Discrete Mathematics, 2015
This paper considers various formulations of the sum-product problem. It is shown that, for a finite set $A\subset{\mathbb{R}}$, $|A(A+A)|\gg{|A|^{\frac{3}{2}+\frac{1}{178}}},$ giving a partial answer to a conjecture of Balog. In a similar spirit, it is established that $|A(A+A+A+A)|\gg{\frac{|A|^2}{\log{|A|}}},$ a bound which is optimal up to constant
Brendan Murphy   +2 more
openaire   +4 more sources

About One Variational Problem, Leading to а Biharmonic Equation, and about the Approximate Solution of the Main Boundary Value Problem for this Equation

open access: yesНаука и техника, 2022
. Many important questions in the theory of elasticity lead to a variational problem associated with a biharmonic equation and to the corresponding boundary value problems for such an equation.
I. N. Meleshko, P. G. Lasy
doaj   +1 more source

A New System of Multivalued Mixed Variational Inequality Problem

open access: yesAbstract and Applied Analysis, 2014
We consider a new system of multivalued mixed variational inequality problem, which includes some known systems of variational inequalities as special cases.
Xi Li, Xue-song Li
doaj   +1 more source

A note on a second order PDE with critical nonlinearity

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2019
In this work, we are interested in a nonlinear PDE of the form: $-\Delta u = K(x) u^\frac{n+2}{n-2}, u>0$ on $\Omega$ and $u=0$ on $\partial\Omega$, where $n\geq 3$ and $\Omega$ is a regular bounded domain of $\mathbb{R}^n$.
Khadijah Sharaf
doaj   +1 more source

Variational Estimation Methods for Sturm–Liouville Problems

open access: yesMathematics, 2022
In this paper, we are concerned with approach solutions for Sturm–Liouville problems (SLP) using variational problem (VP) formulation of regular SLP.
Elena Corina Cipu, Cosmin Dănuţ Barbu
doaj   +1 more source

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