# On the stability of solutions of nonlinear parabolic differential-functional equations

Annales Polonici Mathematici (1996)

- Volume: 63, Issue: 2, page 155-165
- ISSN: 0066-2216

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topStanisław Brzychczy. "On the stability of solutions of nonlinear parabolic differential-functional equations." Annales Polonici Mathematici 63.2 (1996): 155-165. <http://eudml.org/doc/262858>.

@article{StanisławBrzychczy1996,

abstract = {We consider a nonlinear differential-functional parabolic boundary initial value problem
(1)
⎧A z + f(x,z(t,x),z(t,·)) - ∂z/∂t = 0 for t > 0, x ∈ G,
⎨z(t,x) = h(x) for t > 0, x ∈ ∂G,
⎩z(0,x) = φ₀(x) for x ∈ G,
and the associated elliptic boundary value problem with Dirichlet condition
(2)
⎧Az + f(x,z(x),z(·)) = 0 for x ∈ G,
⎨z(x) = h(x) for x ∈ ∂G
⎩
where $x = (x₁,..., x_m) ∈ G ⊂ ℝ^m$, G is an open and bounded domain with $C^\{2+α\}$ (0 < α ≤ 1) boundary, the operator
Az := ∑j,k=1m ajk(x) (∂²z/(∂xj ∂xk))
is uniformly elliptic in G̅ and z is a real $L^p(G)$ function.
The purpose of this paper is to give some conditions which will guarantee that the parabolic problem has a stable solution. Basing on the results obtained in [7] and [5, 6], we prove that the limit of the solution of the parabolic problem (1) as t → ∞ is the solution of the associated elliptic problem (2), obtained by the monotone iterative method. The problem of stability of solutions of the parabolic differential equation has been studied by D. H. Sattinger [14, 15], H. Amann [3, 4], O. Diekmann and N. M. Temme [8], and J. Smoller [17]. Our results generalize these papers to encompass the case of differential-functional equations. Differential-functional equations arise frequently in applied mathematics. For example, equations of this type describe the heat transfer processes and the prediction of ground water level.},

author = {Stanisław Brzychczy},

journal = {Annales Polonici Mathematici},

keywords = {nonlinear differential-functional equations of parabolic and elliptic type; monotone iterative method; method of lower and upper functions; stability of solutions; nonlinear parabolic differential-functional equations},

language = {eng},

number = {2},

pages = {155-165},

title = {On the stability of solutions of nonlinear parabolic differential-functional equations},

url = {http://eudml.org/doc/262858},

volume = {63},

year = {1996},

}

TY - JOUR

AU - Stanisław Brzychczy

TI - On the stability of solutions of nonlinear parabolic differential-functional equations

JO - Annales Polonici Mathematici

PY - 1996

VL - 63

IS - 2

SP - 155

EP - 165

AB - We consider a nonlinear differential-functional parabolic boundary initial value problem
(1)
⎧A z + f(x,z(t,x),z(t,·)) - ∂z/∂t = 0 for t > 0, x ∈ G,
⎨z(t,x) = h(x) for t > 0, x ∈ ∂G,
⎩z(0,x) = φ₀(x) for x ∈ G,
and the associated elliptic boundary value problem with Dirichlet condition
(2)
⎧Az + f(x,z(x),z(·)) = 0 for x ∈ G,
⎨z(x) = h(x) for x ∈ ∂G
⎩
where $x = (x₁,..., x_m) ∈ G ⊂ ℝ^m$, G is an open and bounded domain with $C^{2+α}$ (0 < α ≤ 1) boundary, the operator
Az := ∑j,k=1m ajk(x) (∂²z/(∂xj ∂xk))
is uniformly elliptic in G̅ and z is a real $L^p(G)$ function.
The purpose of this paper is to give some conditions which will guarantee that the parabolic problem has a stable solution. Basing on the results obtained in [7] and [5, 6], we prove that the limit of the solution of the parabolic problem (1) as t → ∞ is the solution of the associated elliptic problem (2), obtained by the monotone iterative method. The problem of stability of solutions of the parabolic differential equation has been studied by D. H. Sattinger [14, 15], H. Amann [3, 4], O. Diekmann and N. M. Temme [8], and J. Smoller [17]. Our results generalize these papers to encompass the case of differential-functional equations. Differential-functional equations arise frequently in applied mathematics. For example, equations of this type describe the heat transfer processes and the prediction of ground water level.

LA - eng

KW - nonlinear differential-functional equations of parabolic and elliptic type; monotone iterative method; method of lower and upper functions; stability of solutions; nonlinear parabolic differential-functional equations

UR - http://eudml.org/doc/262858

ER -

## References

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- [15] D. H. Sattinger, Topics in Stability and Bifurcation Theory, Lecture Notes in Math. 309, Springer, Berlin, 1973. Zbl0248.35003
- [16] J. Schauder, Über lineare elliptische Differentialgleichungen zweiter Ordnung, Math. Z. 38 (1934), 257-282. Zbl0008.25502
- [17] J. Smoller, Shock Waves and Reaction-Diffusion Equations, Springer, New York, 1983. Zbl0508.35002
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