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3 papers
Variational problems with unilateral pointwise functional constraints in variable domains
A. A. Kovalevskyab a Institute of Mathematics and Mechanics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg
b Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg
Abstract:
We consider a sequence of convex integral functionals
$F_s\colon W^{1,p}(\Omega_s)\to\mathbb R$ and a sequence of weakly lower semicontinuous and, in general, non-integral functionals
$G_s\colon W^{1,p}(\Omega_s)\to\mathbb R$, where
$\{\Omega_s\}$ is a sequence of domains of
$\mathbb R^n$ contained in a bounded domain
$\Omega\subset\mathbb R^n$ (
$n\geqslant 2$) and
$p>1$. Along with this, we consider a sequence of closed convex sets $V_s=\{v\in W^{1,p}(\Omega_s)\colon v\geqslant K_s(v)\text{ a.e. in }\Omega_s\}$, where
$K_s$ is a mapping of the space
$W^{1,p}(\Omega_s)$ into the set of all functions defined on
$\Omega_s$. We establish conditions under which minimizers and minimum values of the functionals
$F_s+G_s$ on the sets
$V_s$ converge to a minimizer and the minimum value, respectively, of a certain functional on the set $V=\{v\in W^{1,p}(\Omega)\colon v\geqslant K(v)\text{ a.e. in }\Omega\}$, where
$K$ is a mapping of the space
$W^{1,p}(\Omega)$ into the set of all functions defined on
$\Omega$. These conditions include, in particular, the strong connectedness of the spaces
$W^{1,p}(\Omega_s)$ with the space
$W^{1,p}(\Omega)$, the exhaustion condition of the domain
$\Omega$ by the domains
$\Omega_s$, the
$\Gamma$-convergence of the sequence
$\{F_s\}$ to a functional
$F\colon W^{1,p}(\Omega)\to\mathbb R$, and a certain convergence of the sequence
$\{G_s\}$ to a functional
$G\colon W^{1,p}(\Omega)\to\mathbb R$. We also assume certain conditions that characterize both the internal properties of the mappings
$K_s$ and their relation to the mapping
$K$. In particular, these conditions admit the study of variational problems with unilateral varying irregular obstacles and with varying constraints combining the pointwise dependence and the functional dependence of the integral form.
Keywords:
variable domains, integral functional, unilateral pointwise functional constraints, minimizer, minimum value, $\Gamma$-convergence, strong connectedness.
UDC:
517.972
MSC: 49J40,
49J45 Received: 06.01.2017
DOI:
10.21538/0134-4889-2017-23-2-133-150