Margareta Heilmann

69.

Abel, Ulrich; Acu, Ana-Maria; Heilmann, Margareta; Raşa, Ioan
Korovkin type theorems for operators acting on functions of polynomial and exponential growth on $[0,ınfty)$
2026

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68.

Abel, Ulrich; Acu, Ana-Maria; Heilmann, Margareta; Raşa, Ioan
Commutativity for a general class of Bernstein-Durrmeyer operators
2026

67.

Abel, Ulrich; Acu, Ana-Maria; Heilmann, Margareta; Raşa, Ioan
Positive linear operators fixing two prescribed functions
2026

66.

Abel, Ulrich; Acu, Ana Maria; Heilmann, Margareta; Raşa, Ioan
Asymptotic properties for a general class of Szász-Mirakjan-Durrmeyer operators
Mathematical Methods in the Applied Sciences :734–743
2026

DOI: 10.1002/mma.70185

https://arxiv.org/abs/2407.16474

65.

Abel, Ulrich; Acu, Ana-Maria; Heilmann, Margareta; Raşa, Ioan
Genuine Bernstein-Durrmeyer operators preserving 1 and x^j (II)
Approximation Theory and Special Functions, Page 97--112
ATSF 2024
Ankara, Turkey
Publisher: Springer Nature Switzerland
2026

DOI: 10.1007/978-3-031-93279-3_4

ISBN: 978-3-031-93279-3

64.

Abel, Ulrich; Acu, Ana Maria; Heilmann, Margareta; Raşa, Ioan
Asymptotic expansions for generalized Bernstein-Durrmeyer and genuine Bernstein-Durrmeyer operators
Complex Anal. Oper. Theory, 20
2026

DOI: 10.1007/s11785-026-01929-1

doi.org/10.1007/s11785-026-01929-1

63.

Abel, Ulrich; Acu, Ana Maria; Heilmann, Margareta; Raşa, Ioan
Kernels for composition of positive linear operators
Journal of Mathematical Analysis and Applications, 555 (2) :130052
2026
ISSN: 0022-247X

DOI: 10.1016/j.jmaa.2025.130052

http://www.sciencedirect.com/science/article/pii/S0022247X25008339

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62.

Abel, Ulrich; Acu, Ana Maria; Heilmann, Margareta; Raşa, Ioan
A representation for the integral kernel of the composition of multivariate Bernstein-Durrmeyer operators
2025

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61.

Abel, Ulrich; Acu, Ana Maria; Heilmann, Margareta; Raşa, Ioan
On some Cauchy problems and positive linear operators
Mediterranean Journal of Mathematics, 22
2025

DOI: 10.1007/s00009-024-02778-y

60.

Abel, Ulrich; Acu, Ana Maria; Heilmann, Margareta; Raşa, Ioan
Asymptotic expansions for variants of the gamma and Post–Widder operators preserving 1 and x^j
Mathematical Methods in the Applied Sciences, 47 (18) :13718-13733
2024

DOI: 10.1002/mma.10217

59.

Acu, Ana-Maria; Heilmann, Margareta; Raşa, Ioan; Steopoaie, Ancuta Emilia
Voronovskaja type results for the Aldaz-Kounchev-Render versions of generalized Baskakov operators
Applicable Analysis and Discrete Mathematics :1-16
2024

DOI: 10.2298/AADM230725016A

58.

Abel, Ulrich; Acu, Ana Maria; Heilmann, Margareta; Raşa, Ioan
Commutativity and spectral properties for a general class of Szász-Mirakjan-Durrmeyer operators
Advances in Operator Theory, 10 (1) :14
2024

DOI: 10.1007/s43036-024-00403-z

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57.

Abel, Ulrich; Acu, Ana Maria; Heilmann, Margareta; Raşa, Ioan
Genuine Bernstein–Durrmeyer type operators preserving 1 and $x^j$
Annals of Functional Analysis, 15 (1)
October 2023
Publisher: Springer Science and Business Media LLC
ISSN: 2008-8752

DOI: 10.1007/s43034-023-00305-w

56.

Abel, Ulrich; Acu, Ana Maria; Heilmann, Margareta; Raşa, Ioan
Voronovskaja formula for Aldaz–Kounchev–Render operators: uniform convergence
Analysis and Mathematical Physics, 14 (1)
December 2023
ISSN: 1664-235X

DOI: 10.1007/s13324-023-00861-3

55.

Abel, Ulrich; Acu, Ana Maria; Heilmann, Margareta; Raşa, Ioan
Positive linear operators preserving certain monomials on [0, ∞)
Dolomites Research Notes on Approximation, 16 :1-9
2023
ISSN: 2035-6803

DOI: 10.14658/PUPJ-DRNA-2023-3-2

54.

Acu, Ana-Maria; Heilmann, Margareta; Raşa, Ioan
Some results for the inverse of a Bernstein–Schnabl type operator
Analysis and Mathematical Physics, 13 (1)
2023

DOI: 10.1007/s13324-022-00777-4

53.

Acu, Ana-Maria; Heilmann, Margareta; Raşa, Ioan; Seserman, Andra
Convergence of linking Durrmeyer type modifications of generalized Baskakov operators
Bulletin of the Malaysian Math. Sciences Society, 46 (3)
2023

DOI: 10.1007/s40840-023-01503-4

52.

Acu, Ana-Maria; Heilmann, Margareta; Raşa, Ioan; Seserman, Andra
Poisson approximation to the binomial distribution: extensions to the convergence of positive operators
Rev. Real Acad. Cienc. Exactas Fis. Nat. Ser. A-Mat., 117
2023

DOI: 0.1007/s13398-023-01497-5

51.

Acu, Ana-Maria; Dancs, Madalina; Heilmann, Margareta; Raşa, Ioan; Paşca, Vlad
Voronovskaya type results for special sequences of operators
RACSAM, 116,19
2022

DOI: 10.1007/s13398-021-01157-6

50.

Acu, Ana-Maria; Dancs, Madalina; Heilmann, Margareta; Raşa, Ioan; Paşca, Vlad
A Bernstein-Schnabl type operator
Applicable Analysis and Discrete Mathematics, 16(2) :495-507
2022

DOI: 10.2298/AADM210714011A

49.

Acu, Ana-Maria; Heilmann, Margareta; Raşa, Ioan
Iterates of convolution-type operators
Positivity, 25 :495-506
2021

DOI: 10.1007/s11117-020-00773-7

48.

Acu, Ana-Maria; Heilmann, Margareta; Raşa, Ioan
Eigenstructure and iterates for uniquely ergodic Kantorovich modifications of operators II
Positivity, 25 :1585-1599
2021

DOI: 10.1007/s11117-021-00832-7

47.

Acu, Ana-Maria; Gonska, Heiner; Heilmann, Margareta
Remarks on a Bernstein-type operator of Aldaz, Kounchev and Render
J. Numer. Anal. Approx. Theory, 50 (1) :3-11
2021

DOI: 10.48550/arXiv.2108.07889

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46.

Abel, Ulrich; Heilmann, Margareta; Kushnirevych, Vitaliy
Convergence of linking Baskakov-type operators
Periodica Mathematica Hungarica, 80 :280-288
2020

DOI: 10.1007/s10998-020-00337-y

45.

Berdysheva, Elena; Heilmann, Margareta; Hennings, Katharina
Pointwise convergence of the Bernstein-Durrmeyer operator with respect to a collection of measures
Journal of Approximation Theory, 251, Article 105339
2020

DOI: 10.1016/j.jat.2019.105339