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Wyszukujesz frazę "fixed point iteration" wg kryterium: Temat


Wyświetlanie 1-8 z 8
Tytuł:
Strong convergence of implicit iteration processes for nonexpansive semigroups in Banach spaces
Autorzy:
Kozlowski, W.M.
Tematy:
fixed point
nonexpansive mapping
nonexpansive semigroup
fixed point iteration process
implicit iterative process
strong convergence
uniformly convex Banach space
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Wydawca:
Polskie Towarzystwo Matematyczne
Powiązania:
https://bibliotekanauki.pl/articles/746461.pdf  Link otwiera się w nowym oknie
Opis:
Let \(C\) be a convex compact subset of a uniformly convex Banach space. Let \(\{T_t\}_{t \geq0}\) be a strongly-continuous nonexpansive semigroup on \(C\). Consider the iterative process defined by the sequence of equations $$x_{k+1} =c_k T_{t_{k+1}}(x_{k+1})+(1-c_k)x_k.$$ We prove that, under certain conditions on \(\{c_k\}\) and \(\{t_k\}\), the sequence \(\{x_k\}_{n=1}^\infty\) converges strongly to a common fixed point of the semigroup \(\{T_t\}_{t \geq0}\). There are known results on convergence of such iterative processes for nonexpansive semigroups in Hilbert spaces and Banach spaces with the Opial property, and also weak convergence results in Banach spaces that are simultaneously uniformly convex and uniformly smooth. In this paper, we do not assume the Opial property or uniform smoothness of the norm.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fixed-point iteration based algorithm for a class of nonlinear programming problems
Autorzy:
Belegundu, A. D.
Tematy:
fixed-point iteration
resource allocation
nonlinear programming
optimality criteria
iteracja punku stałego
alokacja zasobów
programowanie nieliniowe
kryteria optymalizacji dwukierunkowych torów wodnych
algorytm punktu stałego
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Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Powiązania:
https://bibliotekanauki.pl/articles/122443.pdf  Link otwiera się w nowym oknie
Opis:
A fixed-point algorithm is presented for a class of singly constrained nonlinear programming (NLP) problems with bounds. Setting the gradient of the Lagrangian equal to zero yields a set of optimality conditions. However, a direct solution on general problems may yield non-KKT points. Under the assumption that the gradient of the objective function is negative while the gradient of the constraint function is positive, and that the variables are positive, it is shown that the fixed-point iterations can converge to a KKT point. An active set strategy is used to handle lower and upper bounds. While fixed-point iteration algorithms can be found in the structural optimization literature, these are presented without clearly stating assumptions under which convergence may be achieved. They are also problem specific as opposed to working with general functions f, g. Here, the algorithm targets general functions which satisfy the stated assumptions. Further, within this general context, the fixed-point variable update formula is given physical significance. Unlike NLP descent methods, no line search is involved to determine step size which involves many function calls or simulations. Thus, the resulting algorithm is vastly superior for the subclass of problems considered. Moreover, the number of function evaluations remains independent of the number of variables allowing the efficient solution of problems with a large number of variables. Applications and numerical examples are presented.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization by the convergence control parameter in iterative methods
Autorzy:
Turkyilmazoglu, Mustafa
Tematy:
fixed point iteration
Adomian decomposition method
homotopy analysis method
convergence control parameter
iteracja punktu stałego
metoda dekompozycji Adomiana
metoda analizy homotopii
parametr kontroli konwergencji
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Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Powiązania:
https://bibliotekanauki.pl/articles/58907598.pdf  Link otwiera się w nowym oknie
Opis:
The classical iterative methods, such as the fixed point iteration, the Adomian decomposition method and the homotopy analysis method are discussed in the present paper. It is proven that adding a convergence control parameter into these makes them powerful and rapidly converging to the true solution, whilst the classical correspondences may fail to or slowly converge to the desired solution. The key is to demonstrate the presence of a continuous interval of the convergence control parameter for the considered problem. This allows convergence of such modified iterative methods with an optimum convergence control parameter obtained from squared residual errors of either the original equation or the derivative of iterative solution with respect to the convergence control parameter.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the construction of common fixed points for semigroups of nonlinear mappings in uniformly convex and uniformly smooth Banach spaces
Autorzy:
Kozlowski, W.M.
Tematy:
common fixed point
Fixed point
Lipschitzian mapping
pointwise Lipschitzian mapping
semigroup of mappings
asymptotic pointwise nonexpansive mapping
uniformly convex Banach space
uniformly smooth Banach space
Fréchet differentiable norm
weak compactness
fixed point iteration process
Krasnosel'skii-Mann process
Mann process
Ishikawa process
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Wydawca:
Polskie Towarzystwo Matematyczne
Powiązania:
https://bibliotekanauki.pl/articles/746293.pdf  Link otwiera się w nowym oknie
Opis:
Let \(C\) be a bounded, closed, convex subset of a uniformly convex and uniformly smooth Banach space \(X\). We investigate the weak convergence of the generalized Krasnosel'skii-Mann and Ishikawa iteration processes to common fixed points of semigroups of nonlinear mappings \(T_t\colon C \to C\). Each of \(T_t\) is assumed to be pointwise Lipschitzian, that is, there exists a family of functions \(\alpha_t\colon C \to [0, \infty)\) such that \(\|T_t(x) - T_t (y)\| \leq\alpha_t (x)\|x -y\|\) for \(x, y \in C\). The paper demonstrates how the weak compactness of \(C\) plays an essential role in proving the weak convergence of these processes to common fixed points.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convergence of an implicit iteration process for a finite family of asymptotically quasi-nonexpansive mappings in convex metric spaces
Autorzy:
Saluja, G. S.
Nashine, H. K.
Tematy:
implicit iteration process
finite family of asymptotically quasi-nonexpansive mappings
common fixed point
convex metric space
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Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:
https://bibliotekanauki.pl/articles/255521.pdf  Link otwiera się w nowym oknie
Opis:
In this paper, we give some necessary and sufficient conditions for an implicit iteration process with errors for a finite family of asymptotically quasi-nonexpansive mappings converging to a common fixed of the mappings in convex metric spaces. Our results extend and improve some recent results of Sun, Wittmann, Xu and Ori, and Zhou and Chang.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convergence theorems for strictly asymptotically pseudocontractive mappings in Hilbert spaces
Autorzy:
Saluja, G. S.
Tematy:
strictly asymptotically pseudo-contractive mapping
implicit iteration scheme
common fixed point
strong convergence
weak convergence
Hilbert space
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Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:
https://bibliotekanauki.pl/articles/255600.pdf  Link otwiera się w nowym oknie
Opis:
In this paper, we establish the weak and strong convergence theorems for a k-strictly asymptotically pseudo-contractive mapping in the framework of Hilbert spaces. Our result improve and extend the corresponding result of Acedo and Xu, Liu, Marino and Xu, Osilike and Akuchu, and some others.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implicit random iteration process with errors for asymptotically quasi-nonexpansive in the intermediate sense random operators
Autorzy:
Saluja, G. S.
Tematy:
asymptotically quasi-nonexpansive in the intermediate sense random operator
implicit random iteration process with errors
common random fixed point
strong convergence
separable uniformly convex Banach space
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:
https://bibliotekanauki.pl/articles/952767.pdf  Link otwiera się w nowym oknie
Opis:
In this paper, we give a necessary and sufficient condition for the strong convergence of an implicit random iteration process with errors to a common fixed point for a finite family of asymptotically quasi-nonexpansive in the intermediate sense random operators and also prove some strong convergence theorems using condition (C) and the semi-compact condition for said iteration scheme and operators. The results presented in this paper extend and improve the recent ones obtained by S. Plubtieng, P. Kumam and R. Wangkeeree, and also by the author.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implicit random iteration process with errors for asymptotically quasi-nonexpansive in the intermediate sense random operators
Autorzy:
Saluja, G. S.
Tematy:
asymptotically quasi-nonexpansive in the intermediate sense random operator
implicit random iteration process with errors
common random fixed point
strong convergence
separable uniformly convex Banach space
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:
https://bibliotekanauki.pl/articles/952775.pdf  Link otwiera się w nowym oknie
Opis:
In this paper, we give a necessary and sufficient condition for the strong convergence of an implicit random iteration process with errors to a common fixed point for a finite family of asymptotically quasi-nonexpansive in the intermediate sense random operators and also prove some strong convergence theorems using condition (C) and the semi-compact condition for said iteration scheme and operators. The results presented in this paper extend and improve the recent ones obtained by S. Plubtieng, P. Kumam and R. Wangkeeree, and also by the author.
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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