Found 101 Documents (Results 1–100)
A semi-randomized Kaczmarz method with simple random sampling for large-scale linear systems. (English) Zbl 1515.65076
MSC:
65F10
Bifurcation of limit cycles from a Liénard system of degree 4. (Chinese. English summary) Zbl 1488.34245
Efficiency of the weak rescaled pure greedy algorithm. (English) Zbl 1478.41010
Reviewer: Stefan Cobzaş (Cluj-Napoca)
Inequalities for the extended best polynomial approximation operator in Orlicz spaces. (English) Zbl 1414.41003
Best \(L_{1}\) approximation of Heaviside-type functions from Chebyshev and weak-Chebyshev spaces. (English) Zbl 1379.41025
Reviewer: Michael M. Pahirya (Mukachevo)
A note on the equioscillation theorem for best ridge function approximation. (English) Zbl 1371.41025
Almost optimality of orthogonal super greedy algorithms for incoherent dictionaries. (English) Zbl 1369.41038
Entropy and sampling numbers of classes of ridge functions. (English) Zbl 1329.41043
Reviewer: Alexander Tovstolis (Orlando)
Weak convexity of sets and functions in a Banach space. (English) Zbl 1330.46070
Reviewer: Costică Mustăţa (Cluj-Napoca)
Inequalities for one-sided operators in Orlicz spaces. (English) Zbl 1333.42035
Díaz, Viviana (ed.) et al., Actas del XII congreso “Dr. Antonio A. R. Monteiro”. Bahía Blanca: Universidad Nacional del Sur, Instituto de Matemática. 149-161 (2014).
Weak second-order explicit stabilized methods for stiff stochastic differential equations. (English) Zbl 1281.65005
Reviewer: Melvin D. Lax (Long Beach)
Common fixed points and invariant approximation for noncommuting asymptotic weak contractions. (English) Zbl 1279.41011
Subweakly biased pairs and Jungck contractions with applications. (English) Zbl 1242.47044
Reviewer: Edward Prempeh (Kumasi)
On a dual characterization in best approximation problem. (English) Zbl 1199.41160
Reviewer: 1263 Tulsi Das Narang (Amritsar)
Total positivity: an application to positive linear operators and to their limiting semigroups. (English) Zbl 1174.41018
Reviewer: Zoltán Finta (Cluj-Napoca)
Boundedness of vector-valued Calderón-Zygmund operators on Herz spaces with non-doubling measures. (English) Zbl 1165.41322
Copositive approximation by elements of weak Chebyshev subspaces. (English) Zbl 1141.41313
Reviewer: Nikola G. Naidenov (Sofia)
On a class of weak Tchebycheff systems. (English) Zbl 1085.41002
Reviewer: Josef Kofroň (Praha)
Symmetrized Chebyshev polynomials. (English) Zbl 1069.41023
Reviewer: Anne Siegel (Rennes)
Approximating weak Chebyshev subspaces by Chebyshev subspaces. (English) Zbl 1029.41015
Reviewer: Yuly Makovoz (Lowell)
Property A in an infinite-dimensional space. II. (English) Zbl 1012.41023
Reviewer: E.Deeba (Houston)
MSC:
41A50
Property A in an infinite-dimensional space. I. (English) Zbl 1012.41024
Reviewer: E.Deeba (Houston)
On polynomial approximation of square integrable functions on a subarc of the unit circle. (English) Zbl 1004.41014
Reviewer: T. D. Narang (Amritsar)
Extension of the best approximation operator in Orlicz spaces and weak-type inequalities. (English) Zbl 0999.41010
Reviewer: Costica Mustăţa (Cluj-Napoca)
The theory of quadratures – concepts and results. (Quadraturtheorie – Konzepte und Resultate.) (German) Zbl 0983.65023
Reviewer: Sven Ehrich (Neuherberg)
Generalized weight approximation by maximal families with applications. (Chinese. English summary) Zbl 1012.41026
Approximation theorems and fixed point theorems for 1-set-contraction mappings in abstract cones. (English) Zbl 0943.47038
Reviewer: Andrei Ronto (Kyïv
Global convexity of curves and polygons. (English) Zbl 0910.68213
MSC:
68U05
An extension of Mairhuber’s theorem for subspaces of \(C_0(X)\) with a unique continuous selection. (English) Zbl 0938.41016
Proceedings of the 3rd international conference on functional analysis and approximation theory, Acquafredda di Maratea (Potenza), Italy, September 23-28, 1996. Vols. I and II. Palermo: Circolo Matemàtico di Palermo, Suppl. Rend. Circ. Mat. Palermo, II. Ser. 52, 265-276 (1998).
Reviewer: A.L.Brown (Chandigarh)
Some remarks on the characterization of best approximations for weak quasi convex set. (Chinese. English summary) Zbl 0919.41014
Reviewer: H.T.Lau (Verdun/Quebec)
MSC:
41A50
On the approximation problem of abstract functions. (Chinese. English summary) Zbl 0861.41028
A theorem about snakes for weak Cartesian systems. (English. Russian original) Zbl 0974.41507
Ukr. Math. J. 47, No. 3, 369-375 (1995); translation from Ukr. Mat. Zh. 47, No. 3, 315-321 (1995).
Reviewer: A.N.Kochubei (Kyïv)
WT measure vector spaces. (English) Zbl 0792.41027
Reviewer: T.D.Narang (Amritsar)
On the duality of a non-convex optimization problem and the strong unicity constant in linear Chebyshev approximation. (English) Zbl 0756.49017
Reviewer: Th.Fischer
On \(A\)-spaces and their relation to the Hobby-Rice theorem. (English) Zbl 0753.41033
Reviewer: Stefan Cobzaş (Cluj-Napoca)
Nondegeneracy and integral representation of weak Markov systems. (English) Zbl 0749.41037
Reviewer: S.Aljančić (Beograd)
Integral representation of normalized weak Markov systems. (English) Zbl 0749.41033
Reviewer: S.Aljančić (Beograd)
A short proof that every weak Tchebycheff system may be transformed into a weak Markov system. (English) Zbl 0744.41028
Reviewer: G.D.Dikshit (Auckland)
On weak Chebyshev subspaces. II: Continuous selection for the metric projection and extension to Mairhuber’s theorem. (English) Zbl 0771.41032
Weak Chebyshev subspaces and A-subspaces of C[a,b]. (English) Zbl 0728.41020
Reviewer: W.Plesniak (Kraków)
Integral representation and embedding of weak Markov systems. (English) Zbl 0688.41038
Reviewer: B.Crstici
Uniqueness of best \(L_ 1\)-approximations from periodic spline spaces. (English) Zbl 0685.41018
Reviewer: D.N.Zarnadze
On extending the domain of definition of Chebyshev and weak Chebyshev systems. (English) Zbl 0684.41025
Reviewer: N.Nashed
Integraldarstellung schwacher Markov-Systeme. (Integral representation of weak Markov systems). (German) Zbl 0693.60060
Osnabrück: Univ., FB Math./Inf., Diss. 78 S. (1988).
Reviewer: B.Crstici
Linear functional analysis. (Russian) Zbl 0683.46001
Reviewer: J.Appell
Asymptotically best approximations of random processes and fields. (English. Russian original) Zbl 0681.60047
Theory Probab. Math. Stat. 39, 109-116 (1989); translation from Teor. Veroyatn. Mat. Stat., Kiev 39, 90-97 (1988).
Reviewer: E.I.Trofimov
Embedding a function into a Haar space. (English) Zbl 0663.41031
Reviewer: S.Cobzaş
Semi-continuity properties of the coapproximation operator. (English) Zbl 0657.41021
Reviewer: R.Precup
Weak Chebyshev spaces on locally ordered topology space and the related continuous metric selections. (English) Zbl 0633.41025
Reviewer: E.J.Barbeau
Weak convergence of convex sets in Banach spaces. (English) Zbl 0632.46015
Reviewer: J.V.Whittaker
Best \(L_{\infty}\)-approximation with constraints by finite dimensional subspaces. (English) Zbl 0614.41035
Approximation theory V, Proc. 5th Int. Symp., College Station/Tex. 1986, 575-578 (1986).
Continuous selections in Chebyshev approximation. (English) Zbl 0585.41032
Parametric optimization and approximation, Conf. Oberwolfach 1983, ISNM 72, 248-263 (1985).
On semi-infinite optimization and Chebyshev approximation with constraints. (English) Zbl 0553.41029
Optimization. Theory and applications. (English) Zbl 0555.49001
Advanced Lectures in Mathematics. Braunschweig-Wiesbaden: Friedr. Vieweg & Sohn. VII, 233 p. DM 39.50; £11.50; $ 15.50 (1984).
Reviewer: M.Studniarski
Some generic properties in convex and non-convex optimization theory. (English) Zbl 0551.49010
Reviewer: C.Zălinescu
A construction theorem of generating new weak Chebyshev spaces. (Chinese. English summary) Zbl 0645.41023
Reviewer: J.H.Tian
MSC:
41A50
Strong unicity constants for finite-dimensional subspaces. (English) Zbl 0541.41029
Approximation theory IV, Proc. int. Conf., Tex. A&M Univ. 1983, 643-648 (1983).
Optimality conditions in nondifferentiable programming and their applications to best approximations. (English) Zbl 0518.49017
Indices and interpolation. (English) Zbl 0506.46057
Prepr., Inst. Math., Pol. Acad. Sci., Warsz. 274, 70 p. (1983).
Continuity and non-multivaluedness properties of metric projections and antiprojections. (English) Zbl 0512.41030
Characterization of continuous selections of the metric projection for a class of weak Chebyshev spaces. (English) Zbl 0492.41040
MSC:
41A50
A characterization of pointwise-Lipschitz-continuous selections for the metric projection. (English) Zbl 0488.41034
The application of weak Tchebycheff systems of numerical analysis. (English) Zbl 0525.41028
Vorlesungsr. SFB 72, Approximation Optimierung, Univ. Bonn 5, 89 p. (1981).
Nonexistence of continuous selections of the metric projection and weak Chebyshev systems. (English) Zbl 0479.41025
Continuous selections for metric projections. (English) Zbl 0472.41029
Quantitative approximation, Proc. int. Symp., Bonn 1979, 301-317 (1980).
On characterization of non-linear best Chebyshev approximations. (English) Zbl 0468.41018
MSC:
41A50
Strong uniqueness of best approximations and weak Chebyshev systems. (English) Zbl 0457.41021
Quantitative approximation, Proc. int. Symp., Bonn 1979, 255-266 (1980).
Lipschitz-stability for programming and approximation problems. (English) Zbl 0429.41031
Numerische Methoden der Approximationstheorie, Bd. 5, Tag. Oberwolfach 1979, ISNM Vol. 52, 9-27 (1980).
\(L_1\)-Approximation by weak Chebyshev spaces. (English) Zbl 0432.41018
Approximation in Theorie und Praxis, Symp. Siegen 1979, 85-102 (1979).
Chebyshev optimal starting approximation by families with the weak betweenness property. (English) Zbl 0418.41022
Estimation of the prior distribution by best approximation in uniformly convex function spaces. (English) Zbl 0395.60028
Some remarks on nonlinear Chebyshev approximation to functions defined on normal spaces. (English) Zbl 0398.41022
Continuity of the metric projection and approximate compactness of subspaces in \(L_ 1(\)S.Sigma.mu). (Russian) Zbl 0483.41031
The theory of the approximation of functions, Proc. Int. Conf. Collect. Artic. Kaluga 1975, 13-20 (1977).
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