---
_id: '5653'
author:
- first_name: C.
  full_name: Badea, C.
  last_name: Badea
- first_name: Irinel Adriana
  full_name: Badea, Irinel Adriana
  last_name: Badea
- first_name: Claudia
  full_name: Cottin, Claudia
  id: '33935'
  last_name: Cottin
  orcid: 0000-0001-9212-5027
  orcid_put_code_url: https://api.orcid.org/v2.0/0000-0001-9212-5027/work/181910957
citation:
  alphadin: '<span style="font-variant:small-caps;">Badea, C.</span> ; <span style="font-variant:small-caps;">Badea,
    Irinel Adriana</span> ; <span style="font-variant:small-caps;">Cottin, Claudia</span>:
    A Korovkin-type theorem for generalizations of Boolean sum operators and approximation
    by trigonometric pseudopolynomials. In: <i>Revue d’Analyse Numérique et de la
    Théorie de l’Approximation</i> Bd. 17 (1988), S. 7–17'
  ama: Badea C, Badea IA, Cottin C. A Korovkin-type theorem for generalizations of
    Boolean sum operators and approximation by trigonometric pseudopolynomials. <i>Revue
    d’Analyse Numérique et de la Théorie de l’Approximation</i>. 1988;17:7-17.
  apa: Badea, C., Badea, I. A., &#38; Cottin, C. (1988). A Korovkin-type theorem for
    generalizations of Boolean sum operators and approximation by trigonometric pseudopolynomials.
    <i>Revue d’Analyse Numérique et de La Théorie de l’Approximation</i>, <i>17</i>,
    7–17.
  bibtex: '@article{Badea_Badea_Cottin_1988, title={A Korovkin-type theorem for generalizations
    of Boolean sum operators and approximation by trigonometric pseudopolynomials},
    volume={17}, journal={Revue d’Analyse Numérique et de la Théorie de l’Approximation},
    author={Badea, C. and Badea, Irinel Adriana and Cottin, Claudia}, year={1988},
    pages={7–17} }'
  chicago: 'Badea, C., Irinel Adriana Badea, and Claudia Cottin. “A Korovkin-Type
    Theorem for Generalizations of Boolean Sum Operators and Approximation by Trigonometric
    Pseudopolynomials.” <i>Revue d’Analyse Numérique et de La Théorie de l’Approximation</i>
    17 (1988): 7–17.'
  ieee: C. Badea, I. A. Badea, and C. Cottin, “A Korovkin-type theorem for generalizations
    of Boolean sum operators and approximation by trigonometric pseudopolynomials,”
    <i>Revue d’Analyse Numérique et de la Théorie de l’Approximation</i>, vol. 17,
    pp. 7–17, 1988.
  mla: Badea, C., et al. “A Korovkin-Type Theorem for Generalizations of Boolean Sum
    Operators and Approximation by Trigonometric Pseudopolynomials.” <i>Revue d’Analyse
    Numérique et de La Théorie de l’Approximation</i>, vol. 17, 1988, pp. 7–17.
  short: C. Badea, I.A. Badea, C. Cottin, Revue d’Analyse Numérique et de La Théorie
    de l’Approximation 17 (1988) 7–17.
date_created: 2025-02-18T11:57:54Z
date_updated: 2026-03-17T15:29:21Z
extern: '1'
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  creator: ccottin
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  date_updated: 2025-02-18T12:13:58Z
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file_date_updated: 2025-02-18T12:13:58Z
has_accepted_license: '1'
intvolume: '        17'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://ictp.acad.ro/jnaat/journal/article/view/1988-vol17-no1-art2/Badea-Badea-Cottin
oa: '1'
page: 7-17
publication: Revue d'Analyse Numérique et de la Théorie de l'Approximation
status: public
title: A Korovkin-type theorem for generalizations of Boolean sum operators and approximation
  by trigonometric pseudopolynomials
type: journal_article
urn: urn:nbn:de:hbz:bi10-56530
user_id: '220548'
volume: 17
year: '1988'
...
---
_id: '5691'
author:
- first_name: Claudia
  full_name: Cottin, Claudia
  id: '33935'
  last_name: Cottin
  orcid: 0000-0001-9212-5027
citation:
  alphadin: '<span style="font-variant:small-caps;">Cottin, Claudia</span>: <i>Quantitative
    Aussagen zur Blending-Typ-Approximation</i>, 1988'
  ama: Cottin C. <i>Quantitative Aussagen zur Blending-Typ-Approximation</i>.; 1988.
  apa: Cottin, C. (1988). <i>Quantitative Aussagen zur Blending-Typ-Approximation</i>.
  bibtex: '@book{Cottin_1988, title={Quantitative Aussagen zur Blending-Typ-Approximation},
    author={Cottin, Claudia}, year={1988} }'
  chicago: Cottin, Claudia. <i>Quantitative Aussagen zur Blending-Typ-Approximation</i>,
    1988.
  ieee: C. Cottin, <i>Quantitative Aussagen zur Blending-Typ-Approximation</i>. 1988.
  mla: Cottin, Claudia. <i>Quantitative Aussagen zur Blending-Typ-Approximation</i>.
    1988.
  short: C. Cottin, Quantitative Aussagen zur Blending-Typ-Approximation, 1988.
date_created: 2025-02-19T07:24:42Z
date_updated: 2026-03-17T15:29:21Z
extern: '1'
language:
- iso: ger
publication_status: published
status: public
title: Quantitative Aussagen zur Blending-Typ-Approximation
type: dissertation
user_id: '220548'
year: '1988'
...
---
_id: '5645'
author:
- first_name: Catalin
  full_name: Badea, Catalin
  last_name: Badea
- first_name: Ioan
  full_name: Badea, Ioan
  last_name: Badea
- first_name: Claudia
  full_name: Cottin, Claudia
  id: '33935'
  last_name: Cottin
  orcid: 0000-0001-9212-5027
- first_name: Heinz H.
  full_name: Gonska, Heinz H.
  last_name: Gonska
citation:
  alphadin: '<span style="font-variant:small-caps;">Badea, Catalin</span> ; <span
    style="font-variant:small-caps;">Badea, Ioan</span> ; <span style="font-variant:small-caps;">Cottin,
    Claudia</span> ; <span style="font-variant:small-caps;">Gonska, Heinz H.</span>:
    Notes on degree of approximation of B-continuous and B-differentiable functions.
    In: <i>Journal of Approximation Theory and its Applications</i> Bd. 4 (1988),
    S. 95–108'
  ama: Badea C, Badea I, Cottin C, Gonska HH. Notes on degree of approximation of
    B-continuous and B-differentiable functions. <i>Journal of Approximation Theory
    and its Applications</i>. 1988;4:95-108.
  apa: Badea, C., Badea, I., Cottin, C., &#38; Gonska, H. H. (1988). Notes on degree
    of approximation of B-continuous and B-differentiable functions. <i>Journal of
    Approximation Theory and Its Applications</i>, <i>4</i>, 95–108.
  bibtex: '@article{Badea_Badea_Cottin_Gonska_1988, title={Notes on degree of approximation
    of B-continuous and B-differentiable functions.}, volume={4}, journal={Journal
    of Approximation Theory and its Applications}, author={Badea, Catalin and Badea,
    Ioan and Cottin, Claudia and Gonska, Heinz H.}, year={1988}, pages={95–108} }'
  chicago: 'Badea, Catalin, Ioan Badea, Claudia Cottin, and Heinz H. Gonska. “Notes
    on Degree of Approximation of B-Continuous and B-Differentiable Functions.” <i>Journal
    of Approximation Theory and Its Applications</i> 4 (1988): 95–108.'
  ieee: C. Badea, I. Badea, C. Cottin, and H. H. Gonska, “Notes on degree of approximation
    of B-continuous and B-differentiable functions.,” <i>Journal of Approximation
    Theory and its Applications</i>, vol. 4, pp. 95–108, 1988.
  mla: Badea, Catalin, et al. “Notes on Degree of Approximation of B-Continuous and
    B-Differentiable Functions.” <i>Journal of Approximation Theory and Its Applications</i>,
    vol. 4, 1988, pp. 95–108.
  short: C. Badea, I. Badea, C. Cottin, H.H. Gonska, Journal of Approximation Theory
    and Its Applications 4 (1988) 95–108.
date_created: 2025-02-18T08:42:00Z
date_updated: 2026-03-17T15:29:20Z
extern: '1'
file:
- access_level: open_access
  content_type: application/pdf
  creator: ccottin
  date_created: 2025-02-18T08:41:38Z
  date_updated: 2025-02-18T08:41:38Z
  file_id: '5646'
  file_name: Scan_JATA1988_CBadea_IBadea_CCottin_HGonska.pdf
  file_size: 5871116
  relation: main_file
  success: 1
file_date_updated: 2025-02-18T08:41:38Z
has_accepted_license: '1'
intvolume: '         4'
language:
- iso: eng
oa: '1'
page: 95-108
publication: Journal of Approximation Theory and its Applications
publication_status: published
status: public
title: Notes on degree of approximation of B-continuous and B-differentiable functions.
type: journal_article
urn: urn:nbn:de:hbz:bi10-56450
user_id: '220548'
volume: 4
year: '1988'
...
---
_id: '4779'
author:
- first_name: P. S.
  full_name: Vassilevski, P. S.
  last_name: Vassilevski
- first_name: Svetozara
  full_name: Petrova, Svetozara
  id: '201871'
  last_name: Petrova
citation:
  alphadin: '<span style="font-variant:small-caps;">Vassilevski, P. S.</span> ; <span
    style="font-variant:small-caps;">Petrova, Svetozara</span>: A note on construction
    of preconditioners in solving 3D elliptic problems by substructuring. In: <i>Comptes
    Rendus de l’Academie Bulgare des Sciences</i> Bd. 41 (1988), Nr. 7, S. 33–36'
  ama: Vassilevski PS, Petrova S. A note on construction of preconditioners in solving
    3D elliptic problems by substructuring. <i>Comptes Rendus de l’Academie Bulgare
    des Sciences</i>. 1988;41(7):33-36.
  apa: Vassilevski, P. S., &#38; Petrova, S. (1988). A note on construction of preconditioners
    in solving 3D elliptic problems by substructuring. <i>Comptes Rendus de l’Academie
    Bulgare Des Sciences</i>, <i>41</i>(7), 33–36.
  bibtex: '@article{Vassilevski_Petrova_1988, title={A note on construction of preconditioners
    in solving 3D elliptic problems by substructuring}, volume={41}, number={7}, journal={Comptes
    Rendus de l’Academie Bulgare des Sciences}, author={Vassilevski, P. S. and Petrova,
    Svetozara}, year={1988}, pages={33–36} }'
  chicago: 'Vassilevski, P. S., and Svetozara Petrova. “A Note on Construction of
    Preconditioners in Solving 3D Elliptic Problems by Substructuring.” <i>Comptes
    Rendus de l’Academie Bulgare Des Sciences</i> 41, no. 7 (1988): 33–36.'
  ieee: P. S. Vassilevski and S. Petrova, “A note on construction of preconditioners
    in solving 3D elliptic problems by substructuring,” <i>Comptes Rendus de l’Academie
    Bulgare des Sciences</i>, vol. 41, no. 7, pp. 33–36, 1988.
  mla: Vassilevski, P. S., and Svetozara Petrova. “A Note on Construction of Preconditioners
    in Solving 3D Elliptic Problems by Substructuring.” <i>Comptes Rendus de l’Academie
    Bulgare Des Sciences</i>, vol. 41, no. 7, 1988, pp. 33–36.
  short: P.S. Vassilevski, S. Petrova, Comptes Rendus de l’Academie Bulgare Des Sciences
    41 (1988) 33–36.
date_created: 2024-07-04T13:52:25Z
date_updated: 2026-03-17T15:29:06Z
intvolume: '        41'
issue: '7'
language:
- iso: eng
page: 33-36
project:
- _id: f432a2ee-bceb-11ed-a251-a83585c5074d
  name: Institute for Data Science Solutions
publication: Comptes Rendus de l’Academie Bulgare des Sciences
status: public
title: A note on construction of preconditioners in solving 3D elliptic problems by
  substructuring
type: journal_article
user_id: '220548'
volume: 41
year: '1988'
...