Constantin Costara

475 total citations
36 papers, 242 citations indexed

About

Constantin Costara is a scholar working on Algebra and Number Theory, Applied Mathematics and Mathematical Physics. According to data from OpenAlex, Constantin Costara has authored 36 papers receiving a total of 242 indexed citations (citations by other indexed papers that have themselves been cited), including 26 papers in Algebra and Number Theory, 20 papers in Applied Mathematics and 19 papers in Mathematical Physics. Recurrent topics in Constantin Costara's work include Advanced Topics in Algebra (26 papers), Holomorphic and Operator Theory (17 papers) and Matrix Theory and Algorithms (13 papers). Constantin Costara is often cited by papers focused on Advanced Topics in Algebra (26 papers), Holomorphic and Operator Theory (17 papers) and Matrix Theory and Algorithms (13 papers). Constantin Costara collaborates with scholars based in Romania, Canada and United States. Constantin Costara's co-authors include Thomas Ransford, Dumitru Popa, Dušan Repovš and Abdellatif Bourhim and has published in prestigious journals such as Journal of Mathematical Analysis and Applications, Journal of Functional Analysis and Bulletin of the London Mathematical Society.

In The Last Decade

Constantin Costara

30 papers receiving 219 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Constantin Costara Romania	9	202	131	104	78	56	36	242
Nathan S. Feldman United States	11	271 1.3×	161 1.2×	169 1.6×	48 0.6×	52 0.9×	27	296
Quentin Menet Belgium	8	146 0.7×	77 0.6×	85 0.8×	45 0.6×	23 0.4×	24	183
Anders Olofsson Sweden	10	273 1.4×	59 0.5×	126 1.2×	95 1.2×	46 0.8×	30	288
Kit C. Chan United States	10	278 1.4×	132 1.0×	131 1.3×	81 1.0×	32 0.6×	37	304
Ameer Athavale India	9	280 1.4×	151 1.2×	205 2.0×	25 0.3×	39 0.7×	29	296
George Costakis Greece	9	254 1.3×	93 0.7×	122 1.2×	93 1.2×	18 0.3×	22	276
Jean Esterlé France	10	179 0.9×	153 1.2×	163 1.6×	97 1.2×	44 0.8×	51	308
Étienne Matheron France	7	147 0.7×	68 0.5×	109 1.0×	64 0.8×	21 0.4×	25	190
Shamim Ansari United States	4	264 1.3×	140 1.1×	172 1.7×	64 0.8×	26 0.5×	5	286
Roman Badora Poland	9	284 1.4×	120 0.9×	155 1.5×	50 0.6×	16 0.3×	29	291

Countries citing papers authored by Constantin Costara

Since Specialization

Citations

This map shows the geographic impact of Constantin Costara's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Constantin Costara with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Constantin Costara more than expected).

Fields of papers citing papers by Constantin Costara

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Constantin Costara. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Constantin Costara. The network helps show where Constantin Costara may publish in the future.

Co-authorship network of co-authors of Constantin Costara

This figure shows the co-authorship network connecting the top 25 collaborators of Constantin Costara. A scholar is included among the top collaborators of Constantin Costara based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Constantin Costara. Constantin Costara is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Costara, Constantin, et al.. (2023). Automorphisms of the total digraph for the ring of square matrices over a field. Linear Algebra and its Applications. 666. 129–143.

Costara, Constantin. (2023). Linear bijective maps preserving spectral functions on pairs of similar operators. Journal of Mathematical Analysis and Applications. 530(2). 127683–127683. 4 indexed citations

Costara, Constantin. (2023). Linear maps that preserve parts of the spectrum on pairs of similar matrices. Electronic Journal of Linear Algebra. 39. 110–116. 2 indexed citations

Costara, Constantin. (2023). Linear maps preserving inclusion of fixed subsets into the spectrum. Linear Algebra and its Applications. 682. 285–294.

Costara, Constantin. (2021). Linear bijective maps preserving fixed values of products of matrices at fixed vectors. Communications in Algebra. 50(3). 920–926. 1 indexed citations

Costara, Constantin. (2020). Nonlinear invertibility preserving maps on matrix algebras. Linear Algebra and its Applications. 602. 216–222. 4 indexed citations

Costara, Constantin. (2020). Linear Maps Preserving Operators of Inner Local Spectral Radius Zero at Some Fixed Vector. Mediterranean Journal of Mathematics. 17(6).

Costara, Constantin. (2020). Linear maps preserving the polynomial numerical radius of matrices. Linear Algebra and its Applications. 595. 63–71. 1 indexed citations

Costara, Constantin. (2019). Nonlinear determinant preserving maps on matrix algebras. Linear Algebra and its Applications. 583. 165–170. 5 indexed citations

10.

Bourhim, Abdellatif & Constantin Costara. (2018). Linear Maps Preserving Matrices of Local Spectral Radius Zero at a Fixed Vector. Canadian Journal of Mathematics. 71(4). 749–771. 3 indexed citations

11.

Costara, Constantin. (2016). On nonlinear maps preserving the reduced minimum modulus on differences of matrices. Linear Algebra and its Applications. 507. 288–299. 1 indexed citations

12.

Costara, Constantin. (2015). Continuous maps preserving local spectra of matrices. Linear Algebra and its Applications. 492. 1–8. 1 indexed citations

13.

Costara, Constantin. (2014). Local spectrum linear preservers at non-fixed vectors. Linear Algebra and its Applications. 457. 154–161. 4 indexed citations

14.

Costara, Constantin & Thomas Ransford. (2013). Which de Branges–Rovnyak spaces are Dirichlet spaces (and vice versa)?. Journal of Functional Analysis. 265(12). 3204–3218. 20 indexed citations

15.

Costara, Constantin. (2011). Maps on matrices that preserve the spectrum. Linear Algebra and its Applications. 435(11). 2674–2680. 11 indexed citations

16.

Costara, Constantin. (2010). Automatic continuity for linear surjective mappings decreasing the local spectral radius at some fixed vector. Archiv der Mathematik. 95(6). 567–573. 18 indexed citations

17.

Costara, Constantin & Thomas Ransford. (2007). On local irreducibility of the spectrum. Proceedings of the American Mathematical Society. 135(9). 2779–2784. 1 indexed citations

18.

Costara, Constantin. (2007). A Cartan type theorem for finite-dimensional algebras. Linear Algebra and its Applications. 426(2-3). 299–304. 5 indexed citations

19.

Costara, Constantin. (2005). On the spectral Nevanlinna–Pick problem. Studia Mathematica. 170(1). 23–55. 30 indexed citations

20.

Costara, Constantin & Dumitru Popa. (2003). Exercises in Functional Analysis. CERN Document Server (European Organization for Nuclear Research). 9 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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