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Analysis of institutional authors

Cobollo, CAuthor

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October 11, 2024
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Article

Banach spaces with small weakly open subsets of the unit ball and massive sets of Daugavet and Delta-points

Publicated to: Revista de la Real Academia de Ciencias Exactas Físicas y Naturales Serie A Matemáticas. 118 (3): 96- - 2024-01-01 118(3), DOI: 10.1007/s13398-024-01596-x

Authors:

Cobollo-Gómez, Christian; Isert, Daniel; López-Pérez, Ginés; Martin, Miguel; Perreau, Yoël; Quero, Alicia; Quilis, Andrés; Rodríguez-Vidanes, D. L.; Rueda Zoca, Abraham
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Affiliations

Czech Tech Univ, Fac Informat Technol, Thakurova 9 - Author
Univ Franche Comte, Lab Math Besancon, UMR 6623, CNRS, 16,route Gray - Author
Univ Granada, Fac Ciencias, Dept Anal Matematico - Author
Univ Politecn Madrid, Escuela Tecn Super Ingn & Diseno Ind, Dept Matemat Aplicada Ingn Ind, Ronda Valencia 3 - Author
Univ Politecn Valencia, Inst Univ Matemat Pura & Aplicada, Camino Vera,s-n - Author
Univ Tartu, Inst Math & Stat, Narva Mnt 18 - Author
Univ Valencia, Dept Anal Matematico, Calle Doctor Moliner,50 - Author
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Abstract

We prove that there exists an equivalent norm vertical bar vertical bar vertical bar center dot vertical bar vertical bar vertical bar on L-infinity[0,1] with the following properties: (1) The unit ball of (L-infinity[0,1], vertical bar vertical bar vertical bar center dot vertical bar vertical bar vertical bar) contains non-empty relatively weakly open subsets of arbitrarily small diameter; (2) The set of Daugavet points of the unit ball of (L-infinity[0,1], vertical bar vertical bar vertical bar vertical bar center dot vertical bar vertical bar vertical bar) is weakly dense; (3) The set of ccw Delta-points of the unit ball of (L-infinity[0,1], vertical bar vertical bar vertical bar center dot vertical bar vertical bar vertical bar) is norming. We also show that there are points of the unit ball of (L-infinity[0,1], vertical bar vertical bar vertical bar center dot vertical bar vertical bar vertical bar) which are not Delta-points, meaning that the space (L-infinity[0,1], vertical bar vertical bar vertical bar center dot vertical bar vertical bar vertical bar) fails the diametral local diameter 2 property. Finally, we observe that the space (L-infinity[0,1], vertical bar vertical bar vertical bar center dot vertical bar vertical bar vertical bar) provides both alternative and new examples that illustrate the differences between the various diametral notions for points of the unit ball of Banach spaces.
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Keywords

Daugavet pointsDelta-pointsPoints of continuityRenormingsSlicesSpace of essentially bounded measurable functions

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

Independientemente del impacto esperado determinado por el canal de difusión, es importante destacar el impacto real observado de la propia aportación.

Según las diferentes agencias de indexación, el número de citas acumuladas por esta publicación hasta la fecha 2026-04-02:

  • WoS: 2
  • Scopus: 2
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Impact and social visibility

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.
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Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: Czech Republic; Estonia; France.

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (Cobollo Gómez, Christian) .

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Awards linked to the item

Funding for open access publishing: Universidad de Granada/CBUA.
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