| Дисертация д-р |
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Иван Иванов Гаджев, ХАРАКТЕРИЗАЦИЯ НА ПРИБЛИЖЕНИЯТА С ОПЕРАТОРИ НА БАСКАКОВ И НА МАЙЕР-КЬОНИГ И ЦЕЛЕР, БАН, Ръководител:проф. Камен Иванов
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2015
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| Научен проект |
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1
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Иван Гаджев, Софийски университет – маркер за иновации и технологичен трансфер (SUMMIT), Член, , Номер на договора:BG-RRP-2.004-0008
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2023
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2
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Иван Гаджев, Нови направления в теория на апроксимациите, Член, , Номер на договора:КП-06-Н62/4
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2022
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3
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Иван Гаджев, Изследване на аналитични концепции, използвани в апроксимациите, диференциалните уравнения и оптимирането, Член,
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2017
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4
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Иван Гаджев, Изследване на аналитични концепции, използвани в апроксимациите, диференциалните уравнения и оптимирането, Член, , Номер на договора:239
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2016
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5
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Иван Гаджев, Съвременни методи в конструктивната теория на функциите, Член, , Номер на договора:ДН 02/14
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2016
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| Статия в научно списание |
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1
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Ivan Gadjev, Parvan E. Parvanov, Rumen Uluchev, On a new modification of Baskakov operators with higher order of approximation , Mathematics, vol:13, issue:1, 2025, pages:1-18, ISSN (online):2227-7390, doi:10.3390/math13010064 , Ref, IF, IF (2.3 - 2023), Web of Science Quartile: Q1 (Mathematics)
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2025
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2
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Borislav R. Draganov, Ivan Gadjev, A strong converse estimate of the rate of approximation by the Kantorovich operator in variable exponent Lebesgue spaces, Boll. Unione Mat. Ital. , 2024, ISSN (print):1972-6724, ISSN (online):2198-2759, doi:10.1007/s40574-024-00430-x, Ref, IF (0.7 - 2023), Web of Science Quartile: Q2 (217/489 Math), SCOPUS, SJR (0.29 - 2023), SCOPUS Quartile: Q3 (Mathematics (Misc)
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2024
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3
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Borislav R. Draganov, Ivan Gadjev, Direct estimates of the rate of approximation by the Kantorovich operator in variable exponent Lebesgue spaces, Mediterr. J. Math., vol:21, issue:article number 112, 2024, ISSN (print):1660-5446, ISSN (online):1660-5454, doi:10.1007/s00009-024-02650-z, Ref, Web of Science, IF (1.1 - 2023), Web of Science Quartile: Q1 (98/490 MATH), SCOPUS, SJR (0.677 - 2024), SCOPUS Quartile: Q2 (Mathematics (Misc)
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2024
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4
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Ivan Gadjev, Parvan E. Parvanov, Rumen Uluchev, Higher order approximation of functions by modified Goodman-Sharma operators, Constructive Mathematical Analysis, vol:7, issue:4, 2024, pages:180-195, ISSN (online):2651-2939, doi:10.33205/cma.1563047, Ref, IF, IF (1.1 - 2023), Web of Science Quartile: Q1 (Mathematics)
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2024
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5
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Ivan Gadjev, On the Constants and Extremal Function and Sequence for Hardy Inequalities in Lp and lp, arxiv.org, 2024
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2024
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6
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Dimitar K. Dimitrov, Ivan Gadjev, Mourad E. H. Ismail, Sharp Hardy's Inequalities in Hilbert Spaces, Journal of Spectral Theory, issue:14, 2024, pages:1243-1256, doi: 10.4171/JST/520, Ref, Web of Science, IF (1 - 2023), Web of Science Quartile: Q1 (2024), SCOPUS, SJR (0.868 - 2023), International
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2024
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7
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Ivan Gadjev, Parvan E. Parvanov, Rumen Uluchev, Strong converse inequality for weighted approximation of functions by the Szasz-Mirakjan-Kantorovich operator, Results in Mathematics, vol:79, issue:Artical number 149, 2024, ISSN (print):1422-6383, ISSN (online):1420-9012, doi:10.1007/s00025-024-02179-3, Ref, IF, IF (1.1 - 2023), Web of Science Quartile: Q1 (Mathematics)
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2024
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8
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Ivan Gadjev, Vasil Gochev, On the constant in the Hardy inequality for finite sequences, Mathematical Inequalities & Applications, vol:26, issue:2, 2023, pages:493-498, ISSN (print):1331-4343, ISSN (online):1848-9966, doi:10.7153/mia-2023-26-31, Ref, Web of Science, IF (1.25 - ), Web of Science Quartile: Q2 (2023), SCOPUS, SJR (0.995 - 2019), SCOPUS Quartile: Q2 (2023)
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2023
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9
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Dimitar K. Dimitrov, Ivan Gadjev, Geno Nikolov, Rumen Uluchev, Hardy’s inequalities in finite dimensional Hilbert spaces, Proceedings of the AMS, vol:Published electronically: March 26, 2021, issue:149, no. 6, 2021, pages:2515-2529, ISSN (print):0002-9939, ISSN (online):1088-6826, doi:https://doi.org/10.1090/proc/15467, Ref, IF, IF (0.971 - 2021), Web of Science Quartile: Q2 (Mathematics), International
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2021
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10
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Gadjev, I., Parvanov, Parvan E., Weighted Approximation of Functions by the Szasz-Mirakjan-Kantorovich Operator, Results Math, vol:76, 158 (2021), 2021, ISSN (print):1422-6383, ISSN (online):1420-9012, doi:10.1007/s00025-021-01472-9, Ref, IF, IF (2.2 - 2022), Web of Science Quartile: Q1 (2021)
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2021
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11
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Ivan Gadjev, A Direct theorem for MKZ-Kantorovich Operator, Analysis Mathematica, vol:45, 2019, pages:25-38, ISSN (print):0133-3852, ISSN (online):1588-273X, doi:10.1007/s10476-018-0636-8, IF, IF (0.478 - 2017), SCOPUS Quartile: Q4 (2017)
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2019
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12
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Borislav R. Draganov, Ivan Gadjev, Approximation of Functions by the Szasz-Mirakjan-Kantorovich Operator, Numerical Functional Analysis and Optimization, vol:40, issue:7, 2019, pages:803-824, ISSN (print):0163-0563, ISSN (online):1532-2467, doi:10.1080/01630563.2018.1557203, Ref, Web of Science, IF (0.896 - 2019), Web of Science Quartile: Q3 (175/261 MATH APPL), SCOPUS, SJR (0.547 - 2019), SCOPUS Quartile: Q3 (Analysis)
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2019
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13
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Borislav R. Draganov, Ivan Gadjev, Direct and converse Voronovskaya estimates for the Bernstein operator, Results in Mathematics, vol:73, issue:1, 2018, ISSN (print):1422-6383, ISSN (online):1420-9012, doi:DOI: 10.1007/s00025-018-0795-8, Ref, Web of Science, IF (0.873 - 2018), Web of Science Quartile: Q2 (Mathematics), SCOPUS, SJR (0.52 - 2018), SCOPUS Quartile: Q2 (Mathematics)
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2018
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14
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Ivan Gadjev, Parvan E. Parvanov, Rumen Uluchev, Weighted approximation by Kantorovich type modification of Meyer-König and Zeller operator, Annual of Sofia University "St. Kliment Ohridski, vol:105, 2018, pages:75-95, ISSN (print):1313-9215, ISSN (online):2603-5529, Ref
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2018
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15
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Ivan Gadjev, About characterization of one K-functional, Journal of Mathematical Analysis and Applications, vol:450, issue:2, 2017, pages:1076-1082, ISSN (print):0022-247X, ISSN (online):0022-247X, doi:10.1016/j.jmaa.2017.01.068, IF, IF (1.138 - 2017), SCOPUS Quartile: Q1 (2017)
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2017
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16
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Gadjev, I., Parvanov, P.E., Weighted Approximation of functions in L_∞[0,∞), Mediterranean Journal of Mathematics, vol:14, issue:6, 2017, pages:220-0, ISSN (print):1660-5446, ISSN (online):1660-5454, doi:10.1007/s00009-017-1021-8 , Ref, Web of Science, IF ( - 2017), SCOPUS Quartile: Q1 (2017 M 70/310 Q1, 2017 AM 121/252 Q2)
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2017
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17
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Ivan Gadjev, Approximation of Functions
by Baskakov-Kantorovich Operator, Results in Mathematics, vol:70, issue:3-4, 2016, pages:385-400, ISSN (print):1422-6383, ISSN (online):1420-9012, doi:10.1007/s00025-016-0554-7, Web of Science, SCOPUS Quartile: Q2 (2016)
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2016
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18
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Ivan Gadjev, Strong converse result for uniform approximation by Meyer-Kӧnig and Zeller operator, J. Math. Anal. Appl., vol:428, issue:1, 2015, pages:32-42, ISSN (print):0022-247X, ISSN (online):0022-247X, doi:10.1016/j.jmaa.2015.03.004, IF, IF (1.014 - 2015), SCOPUS Quartile: Q1 (2015)
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2015
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19
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Ivan Gadjev, Weighted Approximation by Baskakov Operators, Mathematical Inequalities & Applications, vol:18, issue:4, 2015, pages:1443-1461, ISSN (print):1331-4343, ISSN (online):1848-9966, doi:http://dx.doi.org/10.7153/mia-18-112, IF, IF (0.544 - 2015), SCOPUS Quartile: Q3 (2015)
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2015
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20
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Иван Гаджев, ПРИБЛИЖАВАНЕ НА ФУНКЦИ С ОПЕРАТОРА НА МАЙЕР-КЬОНИГ И ЦЕЛЕР, MTC AJ, vol:13, issue:3/2, 2015, pages:51-54, ISSN (print): 1312-3823 , ISSN (online): 2367-6620, Ref
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2015
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21
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Ivan Gadjev, Strong converse result for Baskakov operator, Serdica Math. Journal, vol:40, issue:3-4, 2014, pages:273-318, ISSN (print):1310-6600, ISSN (online):1310-6600, Ref
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2014
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| Статия в сборник (на конференция и др.) |
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1
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Ivan Gadjev, Rumen Uluchev, Strong converse result
for weighted approximation
by Baskakov-Kantorovich operator, "Constructive Theory of Functions", Sozopol 2019, editor/s:B. Draganov, K. Ivanov, G. Nikolov and R. Uluchev, Publisher:Prof. Marin Drinov Publishing House of BAS, 2020, pages:53-71, ISBN:978-619-245-060-1, Ref
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2020
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2
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Ivan Gadjev, Approximation of functions by some exponential-type operators, "Constructive Theory of Functions", Sozopol 2016, editor/s:K. Ivanov, G. Nikolov and R. Uluchev, Publisher:Marin Drinov Academic Publishing House, 2018, pages:143-158, ISBN:978–954–322–931–4, Ref
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2018
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3
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Ivan Gadjev, Weighted approximation by Meyer-Kӧnig and Zeller
operators
, IMI preprint ISSN 1314-541X, 2015
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2015
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| Участие в конференция |
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1
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Секционен доклад, Иван Гаджев, On the constants in Hardy Inequalities in Lp and lp
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2024
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2
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Секционен доклад, Иван Гаджев, Weighted Approximation of Functions in L_p-norm by Kantorovich Modifications of Some Classical Operators
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2024
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3
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Секционен доклад, Иван Гаджев, Sharp Hardy Inequalities in HIlbert Spaces
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2023
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4
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Секционен доклад, Иван Гаджев, Extremal function and sequence for Hardy
Inequalities in Hilbert Spaces
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2023
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5
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Секционен доклад, Иван Гаджев, Weighted approximation of functions in Lp-norm by Baskakov- Kantorovich operator
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2019
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6
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Секционен доклад, Иван Гаджев, Weighted approximation of functions in Lp-norm by some Kantorovich operators
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2019
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7
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Секционен доклад, Иван Гаджев, Approximation of functions in Lp-norm by
Kantorovich modifications of some classical operators
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2018
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8
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Секционен доклад, Иван Гаджев, Approximation of Functions in Lp-norm by Kantorovich Modification of Meyer-König and Zeller operator
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2018
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9
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Секционен доклад, Иван Гаджев, ХАРАКТЕРИЗАЦИЯ НА НЯКОИ К-ФУНКЦИОНАЛИ
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2017
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10
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Секционен доклад, Иван Гаджев, Approximation of functions by Kantorovich-type operators
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2017
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11
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Секционен доклад, Ivan Gadjev, Approximation of Functions in $L_p$-norm by Kantorovich Modifications of Some Classical Operators
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2016
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12
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Секционен доклад, Иван Гаджев, ХАРАКТЕРИЗАЦИЯ НА ПРИБЛИЖЕНИЯТА С ОПЕРАТОРИ НА БАСКАКОВ И НА МАЙЕР-КЬОНИГ И ЦЕЛЕР
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2015
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13
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Секционен доклад, Ivan Gadjev, Approximation by Linear Positive Operators
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2014
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