Optimization Group



2016

32.

Aral, Ali; Gonska, Heiner; Heilmann, Margareta; Tachev, G.
Quantitative Voronovskaya-type Results for Polynomially Bounded Functions
Results in Mathematics, 70 :313-324
2016
2015

31.

Heilmann, Margareta; Raşa, Ioan
On the decomposition of Bernstein operators
Numerical Functional Analysis and Optimization, 36 (1) :72-85
2015

30.

Heilmann, Margareta; Raşa, Ioan
k-th order Kantorovich type modification of linking Baskakov type operators
Mathematical Analysis and its Applications - Proceedings of the Conference ICRTMAA 2014, Roorkee, IndiaVolume 143from Springer Proceedings in Mathematics and Statistics, Page 229-242
International Conference on Recent Trends in Mathematical Analysis and its Applications
Roorkee, India
December 2014
In Agrawal, P.N. and Mohapatra, R.N. and Singh, U. and Srivastava, H.M., Editor
Publisher: Springer
2015

29.

Heilmann, Margareta
Commutativity and Spectral Properties of Genuine Baskakov-Durrmeyer Type Operators and their kth order Kantorovich Modification
Journal of Numerical Analysis and Approximation Theory, 44 (2) :166-179
2015
2014

28.

Heilmann, Margareta; Raşa, Ioan
k-th order Kantorovich type modification of the operators U_n^ρ
Journal of Applied Functional Analysis, 9 (3-4) :20-334
2014
2013

27.

Heilmann, Margareta; Tachev, G.
Linear combinations of genuine Szász-Mirakjan-Durrmeyer operators
Advances in Applied Mathematics and Approximation - Contributions from AMAT 2012Volume 41, Page 85-106
Applied Mathematics and Approximation Theory 2012
Ankara, Turkey
May 2012
In Anastassiou, George A. and Duman, Oktay, Editor
Publisher: Springer Proceedings in Mathematics and Statistics
2013
2012

26.

Gonska, Heiner; Heilmann, Margareta; Lupaş, Alexandru; Raşa, Ioan
On the composition and decomposition of positive linear operators III: A non-trivial decomposition of the Bernstein operator
2012

25.

Heilmann, Margareta; Wagner, M.
Strong converse results for Baskakov-Durrmeyer operators
Constructive Theory of Functions, Proceedings of the International Conference, Sozopol, Bulgaria, 2010, Page 141-149
Constructive Theory of Functions
Sozopol, Bulgaria
June 2010
In G. Nikolov et al., Editor
Publisher: Prof. Marin Drinov Academic Publishing House
2012

24.

Heilmann, Margareta; Wagner, M.
The genuine Bernstein-Durrmeyer operators and quasi-interpolants
Results in Mathematics, 62 (3-4) :319-335
2012
2011

23.

Heilmann, Margareta; Tachev, G.
Commutativity, Direct and Strong Converse Results for Phillips Operators
East Journal on Approximation, 17 (3) :299-317
2011

22.

Gonska, Heiner; Heilmann, Margareta; Raşa, Ioan
Kantorovich operators of order k
Numerical Functional Analysis and Optimization, 32 (7) :717-738
2011
2010

21.

Gonska, Heiner; Heilmann, Margareta; Raşa, Ioan
Asymptotic behaviour of differentiated Bernstein polynomials revisited
General Mathematics, 18 (1) :55-70
2010

20.

Schäfer, M.; Berchtold, W.; Heilmann, Margareta; Zmudzinski, S.; Steinebach, M.
Collosion secure fingerprint watermarking for real world applications
GI-Edition - Lecture Notes in Informatics, Beiträge der 5. Jahrestagung des Fachbereichs Sicherheit der Gesellschaft f, Page 129-140
Publisher: Bonner K
2010

19.

Heilmann, Margareta; Wagner, M.
Strong converse results for Bernstein-Durrmeyer operators and their quasi-interpolants
General Mathematics, 18 (1) :45-53
2010
2009

18.

Gonska, Heiner; Heilmann, Margareta; Raşa, Ioan
Convergence of iterates of genuine and ultraspherical Durrmeyer operators to the limiting semigroup: C^2-estimates
Journal Approx. Theory, 160 :243-255
2009
2004

17.

Abel, Ulrich; Heilmann, Margareta
The complete asymptotic expansion for Bernstein-Durrmeyer operators with Jacobi weights
Mediterranean Journal of Mathematics, 1 (4) :487-499
2004
2003

16.

Heilmann, Margareta
Rodriguez-type representation for the eigenfunctions of Durrmeyer-type operators
Results in Mathematics, 44 (1-2) :97-105
2003

15.

Heilmann, Margareta
Eigenfunctions of Durrmeyer-type modifications of Meyer-König and Zeller operators
Journal of Approximation Theory, 125 (1) :63-73
2003

14.

Heilmann, Margareta
Commutativity of Durrmeyer-type modifications of Meyer-König and Zeller and Baskakov-operators
Constructive Theory of Functions - Proceedings of the International Conference, Varna, Bulgaria, 2002, Page 295-301
In B. Bojanov et al., Editor
Publisher: Sofia: DARBA
2003
1995

13.

Heilmann, Margareta
Explicit Voronovskaja-type results for linear combinations of BDT-operators
Approximation Theory and its Applications, 11 (1) :54-61
1995

12.

Heilmann, Margareta
Saturation of linear combinations of Baskakov-Durrmeyer-type operators
Applicable Analysis, 59 (1-4) :93-107
1995
1992

11.

Heilmann, Margareta
Erhöhung der Konvergenzgeschwindigkeit bei der Approximation von Funktionen mit Hilfe von Linearkombinationen spezieller positiver linearer Operatoren
Universität Dortmund
1992

10.

Heilmann, Margareta
Rate of approximation of weighted derivatives by linear combinations of SMD-operators
Numerical Methods in Approximation Theory - Proceedings of the conference held in Oberwolfach Germany, November 24-30, 1991, Page 97-115
In D. Braess et al., Editor
Publisher: Birkhäuser, Basel, Int. Ser. Numer. Math. 105
1992
1991

9.

Heilmann, Margareta; Müller, Manfred
Equivalence of a weighted modulus of smoothness and a modified weighted K-functional
In Nevai, P. and Pinkus, A., Editor
Publisher: Academic Press
1991
1990

8.

Heilmann, Margareta; Müller, Manfred
Direct and converse results on simultaneous approximation by the method of Bernstein-Durrmeyer operators
Algorithms for approximation II, Proc. 2nd Int. Conf., Shrivenham/UK 1988, Page 107-116
1990

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