Gupta, Vijay The convergence of exponential operators connected with \(x^3\) on functions of bounded variation. (English) Zbl 1513.41029 Miskolc Math. Notes 22, No. 2, 681-686 (2021). MSC: 41A36 PDFBibTeX XMLCite \textit{V. Gupta}, Miskolc Math. Notes 22, No. 2, 681--686 (2021; Zbl 1513.41029) Full Text: DOI
Yıldız, Sevda \(\mathcal{I}_2\)-relative uniform convergence and Korovkin type approximation. (English) Zbl 1495.40006 Acta Comment. Univ. Tartu. Math. 25, No. 2, 189-200 (2021). MSC: 40A35 40B05 41A36 PDFBibTeX XMLCite \textit{S. Yıldız}, Acta Comment. Univ. Tartu. Math. 25, No. 2, 189--200 (2021; Zbl 1495.40006) Full Text: DOI
Lspir, Nurhayat; Deo, Naokant; Bhardwaj, Neha Approximation of Jain operators by statistical convergence. (English) Zbl 1504.41030 Thai J. Math. 19, No. 4, 1187-1197 (2021). Reviewer: José María Almira (Murcia) MSC: 41A36 26A15 41A25 41A30 41A63 PDFBibTeX XMLCite \textit{N. Lspir} et al., Thai J. Math. 19, No. 4, 1187--1197 (2021; Zbl 1504.41030) Full Text: Link
Alotaibi, Abdullah; Özger, Faruk; Mohiuddine, S. A.; Alghamdi, Mohammed A. Approximation of functions by a class of Durrmeyer-Stancu type operators which includes Euler’s beta function. (English) Zbl 1485.41009 Adv. Difference Equ. 2021, Paper No. 13, 14 p. (2021). MSC: 41A35 41A36 41A25 41A10 41A17 PDFBibTeX XMLCite \textit{A. Alotaibi} et al., Adv. Difference Equ. 2021, Paper No. 13, 14 p. (2021; Zbl 1485.41009) Full Text: DOI
Qasim, M.; Khan, A.; Abbas, Z.; Mursaleen, M. Convergence properties of generalized Lupaş-Kantorovich operators. (English) Zbl 1497.41014 Carpathian Math. Publ. 13, No. 3, 818-830 (2021). Reviewer: Vijay Gupta (New Delhi) MSC: 41A25 41A36 PDFBibTeX XMLCite \textit{M. Qasim} et al., Carpathian Math. Publ. 13, No. 3, 818--830 (2021; Zbl 1497.41014) Full Text: DOI
Bozkurt, K.; Limmam, M. L.; Aral, A. Generalization of Szász operators: quantitative estimate and bounded variation. (English) Zbl 1497.41021 Carpathian Math. Publ. 13, No. 3, 775-789 (2021). MSC: 41A36 41A25 PDFBibTeX XMLCite \textit{K. Bozkurt} et al., Carpathian Math. Publ. 13, No. 3, 775--789 (2021; Zbl 1497.41021) Full Text: DOI
Khan, A.; Iliyas, M.; Mansoori, M. S.; Mursaleen, M. Lupaş post quantum Bernstein operators over arbitrary compact intervals. (English) Zbl 1497.41024 Carpathian Math. Publ. 13, No. 3, 734-749 (2021). MSC: 41A36 PDFBibTeX XMLCite \textit{A. Khan} et al., Carpathian Math. Publ. 13, No. 3, 734--749 (2021; Zbl 1497.41024) Full Text: DOI
Erdogan, S.; Olgun, A. Approximation properties of modified Jain-Gamma operators. (English) Zbl 1497.41022 Carpathian Math. Publ. 13, No. 3, 651-665 (2021). MSC: 41A36 41A25 PDFBibTeX XMLCite \textit{S. Erdogan} and \textit{A. Olgun}, Carpathian Math. Publ. 13, No. 3, 651--665 (2021; Zbl 1497.41022) Full Text: DOI
Gupta, Pooja; Ram, Mangey; Dubey, Ramu Image of polynomials under generalized Szász operators. (English) Zbl 1499.41061 Appl. Math., Ser. B (Engl. Ed.) 36, No. 4, 599-610 (2021). MSC: 41A36 PDFBibTeX XMLCite \textit{P. Gupta} et al., Appl. Math., Ser. B (Engl. Ed.) 36, No. 4, 599--610 (2021; Zbl 1499.41061) Full Text: DOI
Hung, Tran Loc On the weak limit theorems for geometric summations of independent random variables together with convergence rates to asymmetric Laplace distributions. (English) Zbl 1492.60124 Bull. Korean Math. Soc. 58, No. 6, 1419-1443 (2021). MSC: 60G50 60F05 60E07 41A36 PDFBibTeX XMLCite \textit{T. L. Hung}, Bull. Korean Math. Soc. 58, No. 6, 1419--1443 (2021; Zbl 1492.60124) Full Text: DOI
Soybaş, Danyal; Malik, Neha Convergence estimates for Gupta-Srivastava operators. (English) Zbl 1499.41081 Kragujevac J. Math. 45, No. 5, 739-749 (2021). MSC: 41A36 41A25 41A30 PDFBibTeX XMLCite \textit{D. Soybaş} and \textit{N. Malik}, Kragujevac J. Math. 45, No. 5, 739--749 (2021; Zbl 1499.41081) Full Text: DOI Link
Sharma, Honey; Maurya, Ramapati Durrmeyer type modification of \((p, q)\)-Szász Mirakjan operators and their quantitative estimates. (English) Zbl 1499.41042 Creat. Math. Inform. 30, No. 1, 97-106 (2021). MSC: 41A35 41A25 41A36 PDFBibTeX XMLCite \textit{H. Sharma} and \textit{R. Maurya}, Creat. Math. Inform. 30, No. 1, 97--106 (2021; Zbl 1499.41042) Full Text: DOI
Agrawal, P. N.; Acu, Ana Maria; Chauhan, Ruchi; Garg, Tarul Approximation of Bögel continuous functions and deferred weighted A-statistical convergence by Bernstein-Kantorovich type operators on a triangle. (English) Zbl 1494.41009 J. Math. Inequal. 15, No. 4, 1695-1711 (2021). MSC: 41A36 41A25 26A15 PDFBibTeX XMLCite \textit{P. N. Agrawal} et al., J. Math. Inequal. 15, No. 4, 1695--1711 (2021; Zbl 1494.41009) Full Text: DOI
Acu, Ana Maria; Raşa, Ioan On the composition and decomposition of positive linear operators (VII). (English) Zbl 1513.41017 Appl. Anal. Discrete Math. 15, No. 1, 213-232 (2021). MSC: 41A36 PDFBibTeX XMLCite \textit{A. M. Acu} and \textit{I. Raşa}, Appl. Anal. Discrete Math. 15, No. 1, 213--232 (2021; Zbl 1513.41017) Full Text: DOI
Ordóñez Cabrera, Manuel; Rosalsky, Andrew; Ünver, Mehmet; Volodin, Andrei Correction to: “On the concept of \(B\)-statistical uniform integrability of weighted sums of random variables and the law of large numbers with mean convergence in the statistical sense”. (English) Zbl 1482.60051 Test 30, No. 4, 1076-1077 (2021). MSC: 60F25 40A35 41A36 PDFBibTeX XMLCite \textit{M. Ordóñez Cabrera} et al., Test 30, No. 4, 1076--1077 (2021; Zbl 1482.60051) Full Text: DOI
Hamal, Hayatem; Sabancigil, Pembe Some approximation properties of new \(( p,q ) \)-analogue of Balázs-Szabados operators. (English) Zbl 1504.41029 J. Inequal. Appl. 2021, Paper No. 162, 14 p. (2021). MSC: 41A36 41A10 41A25 41A35 30E10 PDFBibTeX XMLCite \textit{H. Hamal} and \textit{P. Sabancigil}, J. Inequal. Appl. 2021, Paper No. 162, 14 p. (2021; Zbl 1504.41029) Full Text: DOI
Bustamante, Jorge; Merino-García, Juan Jesús; Quesada, José María Baskakov operators and Jacobi weights: pointwise estimates. (English) Zbl 1504.41028 J. Inequal. Appl. 2021, Paper No. 119, 17 p. (2021). MSC: 41A36 41A25 41A35 41A17 41A27 PDFBibTeX XMLCite \textit{J. Bustamante} et al., J. Inequal. Appl. 2021, Paper No. 119, 17 p. (2021; Zbl 1504.41028) Full Text: DOI
Wani, Shahid Ahmad; Mursaleen, M.; Nisar, Kottakkaran Sooppy Certain approximation properties of Brenke polynomials using Jakimovski-Leviatan operators. (English) Zbl 1504.41031 J. Inequal. Appl. 2021, Paper No. 104, 16 p. (2021). MSC: 41A36 41A25 33C45 41A35 41A10 PDFBibTeX XMLCite \textit{S. A. Wani} et al., J. Inequal. Appl. 2021, Paper No. 104, 16 p. (2021; Zbl 1504.41031) Full Text: DOI
Zhang, Chungou; Meng, Xiangying; Zhang, Jingwen On preservation of binomial operators. (English) Zbl 1504.41033 J. Inequal. Appl. 2021, Paper No. 50, 8 p. (2021). MSC: 41A36 41A35 05A40 41A10 05A15 PDFBibTeX XMLCite \textit{C. Zhang} et al., J. Inequal. Appl. 2021, Paper No. 50, 8 p. (2021; Zbl 1504.41033) Full Text: DOI
Nasiruzzaman, Md.; Alotaibi, Abdullah; Mursaleen, M. Dunkl-type generalization of the second kind beta operators via \((p, Q)\)-calculus. (English) Zbl 1504.41016 J. Inequal. Appl. 2021, Paper No. 6, 13 p. (2021). MSC: 41A25 41A36 33C45 PDFBibTeX XMLCite \textit{Md. Nasiruzzaman} et al., J. Inequal. Appl. 2021, Paper No. 6, 13 p. (2021; Zbl 1504.41016) Full Text: DOI
Deo, Naokant; Kumar, Sandeep Durrmeyer variant of Apostol-Genocchi-Baskakov operators. (English) Zbl 1493.41015 Quaest. Math. 44, No. 12, 1817-1834 (2021). MSC: 41A36 41A81 PDFBibTeX XMLCite \textit{N. Deo} and \textit{S. Kumar}, Quaest. Math. 44, No. 12, 1817--1834 (2021; Zbl 1493.41015) Full Text: DOI
Acar, Ecem; Izgi, Aydin On approximation by generalized Bernstein-Durrmeyer operators. (English) Zbl 1495.41013 J. Adv. Math. Stud. 14, No. 3, 352-361 (2021). MSC: 41A36 41A10 41A25 PDFBibTeX XMLCite \textit{E. Acar} and \textit{A. Izgi}, J. Adv. Math. Stud. 14, No. 3, 352--361 (2021; Zbl 1495.41013) Full Text: Link
Anastassiou, George A. Generalized \(\psi\)-fractional approximation by sublinear operators. (English) Zbl 1486.41011 Acta Math. Univ. Comen., New Ser. 90, No. 1, 43-60 (2021). MSC: 41A36 26A33 41A17 41A25 PDFBibTeX XMLCite \textit{G. A. Anastassiou}, Acta Math. Univ. Comen., New Ser. 90, No. 1, 43--60 (2021; Zbl 1486.41011) Full Text: Link
Kadak, Uğur; Özger, Faruk A numerical comparative study of generalized Bernstein-Kantorovich operators. (English) Zbl 1491.41003 Math. Found. Comput. 4, No. 4, 311-332 (2021). Reviewer: Zoltán Finta (Cluj-Napoca) MSC: 41A10 26A16 40C05 41A25 41A36 PDFBibTeX XMLCite \textit{U. Kadak} and \textit{F. Özger}, Math. Found. Comput. 4, No. 4, 311--332 (2021; Zbl 1491.41003) Full Text: DOI
Rao, Nadeem; Wafi, Abdul; Deepmala Szász-type operators which preserves \(e_0\) and \(e_2\). (English) Zbl 1498.41014 Thai J. Math. 19, No. 1, 197-209 (2021). Reviewer: Neha Malik (New Delhi) MSC: 41A25 41A36 PDFBibTeX XMLCite \textit{N. Rao} et al., Thai J. Math. 19, No. 1, 197--209 (2021; Zbl 1498.41014) Full Text: Link
Rao, Nadeem; Wafi, Abdul Modified Szász operators involving Charlier polynomials based on two parameters. (English) Zbl 1527.41006 Thai J. Math. 19, No. 1, 131-144 (2021). MSC: 41A36 41A10 41A25 PDFBibTeX XMLCite \textit{N. Rao} and \textit{A. Wafi}, Thai J. Math. 19, No. 1, 131--144 (2021; Zbl 1527.41006) Full Text: Link
Prakash, Chandra; Verma, Durvesh Kumar; Deo, Naokant Approximation by a new sequence of operators involving Apostol-Genocchi polynomials. (English) Zbl 1491.41004 Math. Slovaca 71, No. 5, 1179-1188 (2021). MSC: 41A10 41A36 41A81 PDFBibTeX XMLCite \textit{C. Prakash} et al., Math. Slovaca 71, No. 5, 1179--1188 (2021; Zbl 1491.41004) Full Text: DOI
Yildiz, Sevda Korovkin type approximation via statistical \(e\)-convergence on two dimensional weighted spaces. (English) Zbl 1489.40012 Math. Slovaca 71, No. 5, 1167-1178 (2021). MSC: 40A35 40B05 41A25 41A36 PDFBibTeX XMLCite \textit{S. Yildiz}, Math. Slovaca 71, No. 5, 1167--1178 (2021; Zbl 1489.40012) Full Text: DOI
Dorai, Abderra A Korovkin-type theorem for sequences of positive linear operators on function spaces. (English) Zbl 1493.41016 Positivity 25, No. 5, 2017-2027 (2021). Reviewer: Jorge Bustamante González (Puebla) MSC: 41A36 47B65 47B92 PDFBibTeX XMLCite \textit{A. Dorai}, Positivity 25, No. 5, 2017--2027 (2021; Zbl 1493.41016) Full Text: DOI
Popa, Dumitru Korovkin type results for the uniform convergence at a point. (English) Zbl 1484.41011 Positivity 25, No. 4, 1631-1649 (2021). MSC: 41A35 41A36 41A60 PDFBibTeX XMLCite \textit{D. Popa}, Positivity 25, No. 4, 1631--1649 (2021; Zbl 1484.41011) Full Text: DOI
Acu, Ana-Maria; Heilmann, Margareta; Rasa, Ioan Eigenstructure and iterates for uniquely ergodic Kantorovich modifications of operators. II. (English) Zbl 1490.41012 Positivity 25, No. 4, 1585-1599 (2021). Reviewer: Neha Malik (New Delhi) MSC: 41A36 41A25 47A35 PDFBibTeX XMLCite \textit{A.-M. Acu} et al., Positivity 25, No. 4, 1585--1599 (2021; Zbl 1490.41012) Full Text: DOI
Braha, Naim L.; Srivastava, H. M.; Et, Mikail Some weighted statistical convergence and associated Korovkin and Voronovskaya type theorems. (English) Zbl 1487.40007 J. Appl. Math. Comput. 65, No. 1-2, 429-450 (2021). MSC: 40G15 41A36 40A35 46A45 PDFBibTeX XMLCite \textit{N. L. Braha} et al., J. Appl. Math. Comput. 65, No. 1--2, 429--450 (2021; Zbl 1487.40007) Full Text: DOI
Braha, Naim L.; Mansour, Toufik; Mursaleen, M.; Acar, Tuncer Convergence of \(\lambda\)-Bernstein operators via power series summability method. (English) Zbl 1487.40006 J. Appl. Math. Comput. 65, No. 1-2, 125-146 (2021). MSC: 40G10 40C15 41A36 40A35 PDFBibTeX XMLCite \textit{N. L. Braha} et al., J. Appl. Math. Comput. 65, No. 1--2, 125--146 (2021; Zbl 1487.40006) Full Text: DOI
Ordóñez Cabrera, Manuel; Rosalsky, Andrew; Ünver, Mehmet; Volodin, Andrei On the concept of \(B\)-statistical uniform integrability of weighted sums of random variables and the law of large numbers with mean convergence in the statistical sense. (English) Zbl 1479.60071 Test 30, No. 1, 83-102 (2021); correction ibid. 30, No. 4, 1076-1077 (2021). MSC: 60F25 40A35 41A36 PDFBibTeX XMLCite \textit{M. Ordóñez Cabrera} et al., Test 30, No. 1, 83--102 (2021; Zbl 1479.60071) Full Text: DOI
Köroğlu, Bülent; Taşdelen Yeşildal, Fatma On the eigenstructure of the \((\alpha,q)\)-Bernstein operator. (English) Zbl 1488.41055 Hacet. J. Math. Stat. 50, No. 4, 1111-1122 (2021). MSC: 41A36 41A10 PDFBibTeX XMLCite \textit{B. Köroğlu} and \textit{F. Taşdelen Yeşildal}, Hacet. J. Math. Stat. 50, No. 4, 1111--1122 (2021; Zbl 1488.41055) Full Text: DOI arXiv
Yıldız, Sevda \(\mathcal{F}\)-relative \(\mathcal{A}\)-summation process for double sequences and abstract Korovkin type theorems. (English) Zbl 1499.40063 Hacet. J. Math. Stat. 50, No. 4, 1047-1062 (2021). MSC: 40C05 41A36 46E30 47B38 PDFBibTeX XMLCite \textit{S. Yıldız}, Hacet. J. Math. Stat. 50, No. 4, 1047--1062 (2021; Zbl 1499.40063) Full Text: DOI
Anastassiou, George A. Generalized fractional calculus. New advancements and applications. (English) Zbl 1473.26001 Studies in Systems, Decision and Control 305. Cham: Springer (ISBN 978-3-030-56961-7/hbk; 978-3-030-56964-8/pbk; 978-3-030-56962-4/ebook). xv, 498 p. (2021). MSC: 26-02 26A33 26D10 26D15 41A36 60G17 60G22 PDFBibTeX XMLCite \textit{G. A. Anastassiou}, Generalized fractional calculus. New advancements and applications. Cham: Springer (2021; Zbl 1473.26001) Full Text: DOI
Çetin, Nursel Approximation by \(\alpha\)-Bernstein-Schurer operator. (English) Zbl 1488.41046 Hacet. J. Math. Stat. 50, No. 3, 732-743 (2021). MSC: 41A36 41A10 41A25 PDFBibTeX XMLCite \textit{N. Çetin}, Hacet. J. Math. Stat. 50, No. 3, 732--743 (2021; Zbl 1488.41046) Full Text: DOI
Maheshwari Sharma, Prerna Iterative combinations for Srivastava-Gupta operators. (English) Zbl 1490.41013 Asian-Eur. J. Math. 14, No. 7, Article ID 2150108, 10 p. (2021). Reviewer: Paola Lamberti (Torino) MSC: 41A36 41A28 PDFBibTeX XMLCite \textit{P. Maheshwari Sharma}, Asian-Eur. J. Math. 14, No. 7, Article ID 2150108, 10 p. (2021; Zbl 1490.41013) Full Text: DOI
Kumar, Ajay; Pratap, Ram Approximation by modified Szász-Kantorovich type operators based on brenke type polynomials. (English) Zbl 1482.41017 Ann. Univ. Ferrara, Sez. VII, Sci. Mat. 67, No. 2, 337-354 (2021). MSC: 41A36 26A15 40A35 41A25 PDFBibTeX XMLCite \textit{A. Kumar} and \textit{R. Pratap}, Ann. Univ. Ferrara, Sez. VII, Sci. Mat. 67, No. 2, 337--354 (2021; Zbl 1482.41017) Full Text: DOI
Gupta, Vijay; Rassias, Michael Th. Computation and approximation. (English) Zbl 1497.41004 SpringerBriefs in Mathematics. Cham: Springer (ISBN 978-3-030-85562-8/pbk; 978-3-030-85563-5/ebook). vii, 99 p. (2021). Reviewer: Naokant Deo (Delhi) MSC: 41A10 26A15 41A25 41A36 PDFBibTeX XMLCite \textit{V. Gupta} and \textit{M. Th. Rassias}, Computation and approximation. Cham: Springer (2021; Zbl 1497.41004) Full Text: DOI
Aral, Ali; Ari, Didem Aydin; Yılmaz, Başar A note on Kantorovich type Bernstein Chlodovsky operators which preserve exponential function. (English) Zbl 1483.41006 J. Math. Inequal. 15, No. 3, 1173-1183 (2021). Reviewer: Naokant Deo (Delhi) MSC: 41A25 41A36 PDFBibTeX XMLCite \textit{A. Aral} et al., J. Math. Inequal. 15, No. 3, 1173--1183 (2021; Zbl 1483.41006) Full Text: DOI
Lian, Boyong On the approximation properties of a new family of Chlodovsky operators. (English) Zbl 1488.41058 Adv. Math., Beijing 50, No. 3, 399-408 (2021). MSC: 41A36 41A25 PDFBibTeX XMLCite \textit{B. Lian}, Adv. Math., Beijing 50, No. 3, 399--408 (2021; Zbl 1488.41058)
Qi, Qiulan; Guo, Dandan Approximation properties of a new Bernstein-Bézier operators with parameters. (Chinese. English summary) Zbl 1488.41061 Acta Math. Sci., Ser. A, Chin. Ed. 41, No. 3, 583-594 (2021). MSC: 41A36 41A10 41A25 PDFBibTeX XMLCite \textit{Q. Qi} and \textit{D. Guo}, Acta Math. Sci., Ser. A, Chin. Ed. 41, No. 3, 583--594 (2021; Zbl 1488.41061)
Gupta, Vijay; Aral, Ali; Muraru, Carmen-Violeta Modification of exponential type operators preserving exponential functions connected with \(x^3\). (English) Zbl 1475.41009 Mediterr. J. Math. 18, No. 5, Paper No. 222, 14 p. (2021). MSC: 41A36 41A25 PDFBibTeX XMLCite \textit{V. Gupta} et al., Mediterr. J. Math. 18, No. 5, Paper No. 222, 14 p. (2021; Zbl 1475.41009) Full Text: DOI
Wu, Yun-Shun; Cheng, Wen-Tao; Chen, Feng-Lin; Zhou, Yong-Hui Approximation theorem for new modification of \(q\)-Bernstein operators on (0,1). (English) Zbl 1477.41013 J. Funct. Spaces 2021, Article ID 6694032, 9 p. (2021). Reviewer: Neha Malik (New Delhi) MSC: 41A36 PDFBibTeX XMLCite \textit{Y.-S. Wu} et al., J. Funct. Spaces 2021, Article ID 6694032, 9 p. (2021; Zbl 1477.41013) Full Text: DOI
Kumar, Abhishek A new kind of variant of the Kantorovich type modification operators introduced by D. D. Stancu. (English) Zbl 1477.41011 Results Appl. Math. 11, Article ID 100158, 19 p. (2021). MSC: 41A36 26A15 PDFBibTeX XMLCite \textit{A. Kumar}, Results Appl. Math. 11, Article ID 100158, 19 p. (2021; Zbl 1477.41011) Full Text: DOI
Aslan, Reşat On approximation results by modified Bernstein operators via \((p,q)\)-calculus. (English) Zbl 1472.41012 J. Adv. Math. Stud. 14, No. 2, 236-250 (2021). MSC: 41A36 41A10 41A25 PDFBibTeX XMLCite \textit{R. Aslan}, J. Adv. Math. Stud. 14, No. 2, 236--250 (2021; Zbl 1472.41012) Full Text: Link
Arpaguş, Seda; Olgun, Ali Approximation properties of modified Baskakov gamma operators. (English) Zbl 1488.41042 Facta Univ., Ser. Math. Inf. 36, No. 1, 125-141 (2021). MSC: 41A36 41A10 41A25 PDFBibTeX XMLCite \textit{S. Arpaguş} and \textit{A. Olgun}, Facta Univ., Ser. Math. Inf. 36, No. 1, 125--141 (2021; Zbl 1488.41042) Full Text: DOI
Yilmaz, Başar Approximation properties of modified Gauss-Weierstrass integral operators in exponentially weighted \(L_p\) spaces. (English) Zbl 1488.41066 Facta Univ., Ser. Math. Inf. 36, No. 1, 89-100 (2021). MSC: 41A36 41A81 PDFBibTeX XMLCite \textit{B. Yilmaz}, Facta Univ., Ser. Math. Inf. 36, No. 1, 89--100 (2021; Zbl 1488.41066) Full Text: DOI
Çınar, Selin Triangular \(A\)-statistical relative uniform convergence for double sequences of positive linear operators. (English) Zbl 1488.40017 Facta Univ., Ser. Math. Inf. 36, No. 1, 65-77 (2021). MSC: 40A35 41A25 41A36 40B05 PDFBibTeX XMLCite \textit{S. Çınar}, Facta Univ., Ser. Math. Inf. 36, No. 1, 65--77 (2021; Zbl 1488.40017) Full Text: DOI
Abel, Ulrich; Leviatan, Dany; Raşa, Ioan On the \(q\)-monotonicity preservation of Durrmeyer-type operators. (English) Zbl 1484.41003 Mediterr. J. Math. 18, No. 4, Paper No. 173, 15 p. (2021). Reviewer: Zoltán Finta (Cluj-Napoca) MSC: 41A10 41A29 41A36 PDFBibTeX XMLCite \textit{U. Abel} et al., Mediterr. J. Math. 18, No. 4, Paper No. 173, 15 p. (2021; Zbl 1484.41003) Full Text: DOI
Popa, Dumitru The Korovkin parabola envelopes method and Voronovskaja-type results. (English) Zbl 1484.41005 Mediterr. J. Math. 18, No. 4, Paper No. 150, 14 p. (2021). Reviewer: Zoltán Finta (Cluj-Napoca) MSC: 41A10 41A25 41A35 41A36 PDFBibTeX XMLCite \textit{D. Popa}, Mediterr. J. Math. 18, No. 4, Paper No. 150, 14 p. (2021; Zbl 1484.41005) Full Text: DOI
Lipi, KM.; Deo, Naokant On modification of certain exponential type operators preserving constant and \(e^{-x}\). (English) Zbl 1475.41010 Bull. Malays. Math. Sci. Soc. (2) 44, No. 5, 3269-3284 (2021). MSC: 41A36 41A25 PDFBibTeX XMLCite \textit{KM. Lipi} and \textit{N. Deo}, Bull. Malays. Math. Sci. Soc. (2) 44, No. 5, 3269--3284 (2021; Zbl 1475.41010) Full Text: DOI
Agrawal, P. N.; Kajla, Arun; Kumar, Dharmendra Modified \(\rho\)-Bernstein operators for functions of two variables. (English) Zbl 1471.41010 Numer. Funct. Anal. Optim. 42, No. 9, 1073-1095 (2021). MSC: 41A36 41A10 41A25 41A63 PDFBibTeX XMLCite \textit{P. N. Agrawal} et al., Numer. Funct. Anal. Optim. 42, No. 9, 1073--1095 (2021; Zbl 1471.41010) Full Text: DOI
Khan, A.; Abbas, Z.; Qasim, M.; Mursaleen, M. Approximation by modified Lupaş-Stancu operators based on \((p, q)\)-integers. (English) Zbl 1488.41054 Eurasian Math. J. 12, No. 2, 39-51 (2021). MSC: 41A36 41A10 41A25 PDFBibTeX XMLCite \textit{A. Khan} et al., Eurasian Math. J. 12, No. 2, 39--51 (2021; Zbl 1488.41054) Full Text: MNR
Abel, Ulrich; Gupta, Vijay A complete asymptotic expansion for operators of exponential type with \(p\left( x\right) =x\left( 1+x\right)^2\). (English) Zbl 1476.41010 Positivity 25, No. 3, 1013-1025 (2021). Reviewer: Neha Malik (New Delhi) MSC: 41A25 41A36 PDFBibTeX XMLCite \textit{U. Abel} and \textit{V. Gupta}, Positivity 25, No. 3, 1013--1025 (2021; Zbl 1476.41010) Full Text: DOI
Păltănea, Radu Durrmeyer type operators on a simplex. (English) Zbl 1488.41060 Constr. Math. Anal. 4, No. 2, 215-228 (2021). MSC: 41A36 41A25 PDFBibTeX XMLCite \textit{R. Păltănea}, Constr. Math. Anal. 4, No. 2, 215--228 (2021; Zbl 1488.41060) Full Text: DOI
Campiti, Michele On the Korovkin-type approximation of set-valued continuous functions. (English) Zbl 1488.41082 Constr. Math. Anal. 4, No. 1, 119-134 (2021). MSC: 41A65 26E25 41A36 PDFBibTeX XMLCite \textit{M. Campiti}, Constr. Math. Anal. 4, No. 1, 119--134 (2021; Zbl 1488.41082) Full Text: DOI
Kutateladze, Semën Samsonovich Infimal generators and monotone sublinear operators. (English) Zbl 1488.41057 Constr. Math. Anal. 4, No. 1, 91-92 (2021). MSC: 41A36 46A40 PDFBibTeX XMLCite \textit{S. S. Kutateladze}, Constr. Math. Anal. 4, No. 1, 91--92 (2021; Zbl 1488.41057) Full Text: DOI
Gupta, Vijay; Holhoş, Adrian Approximation with arbitrary order by Baskakov-type operators preserving exponential functions. (English) Zbl 1477.41009 Bull. Malays. Math. Sci. Soc. (2) 44, No. 4, 2567-2576 (2021). Reviewer: Włodzimierz Łenski (Poznań) MSC: 41A25 41A30 41A36 PDFBibTeX XMLCite \textit{V. Gupta} and \textit{A. Holhoş}, Bull. Malays. Math. Sci. Soc. (2) 44, No. 4, 2567--2576 (2021; Zbl 1477.41009) Full Text: DOI
Braha, Naim L.; Mansour, Toufik; Mursaleen, M. Approximation by modified Meyer-König and Zeller operators via power series summability method. (English) Zbl 1481.40004 Bull. Malays. Math. Sci. Soc. (2) 44, No. 4, 2005-2019 (2021). MSC: 40G10 40C15 41A36 40A35 PDFBibTeX XMLCite \textit{N. L. Braha} et al., Bull. Malays. Math. Sci. Soc. (2) 44, No. 4, 2005--2019 (2021; Zbl 1481.40004) Full Text: DOI
Gadjev, Ivan; Parvanov, Parvan E. Weighted approximation of functions by the Szász-Mirakjan-Kantorovich operator. (English) Zbl 1471.41016 Result. Math. 76, No. 3, Paper No. 158, 20 p. (2021). MSC: 41A81 41A17 41A36 PDFBibTeX XMLCite \textit{I. Gadjev} and \textit{P. E. Parvanov}, Result. Math. 76, No. 3, Paper No. 158, 20 p. (2021; Zbl 1471.41016) Full Text: DOI
Srivastava, Hari M.; Jena, Bidu Bhusan; Paikray, Susanta Kumar Statistical product convergence of martingale sequences and its applications to Korovkin-type approximation theorems. (English) Zbl 1481.40002 Math. Methods Appl. Sci. 44, No. 11, 9600-9610 (2021). MSC: 40A35 40G15 60G42 41A36 PDFBibTeX XMLCite \textit{H. M. Srivastava} et al., Math. Methods Appl. Sci. 44, No. 11, 9600--9610 (2021; Zbl 1481.40002) Full Text: DOI
Kajla, Arun; Mohiuddine, S. A.; Alotaibi, Abdullah Blending-type approximation by Lupaş-Durrmeyer-type operators involving Pólya distribution. (English) Zbl 1470.41020 Math. Methods Appl. Sci. 44, No. 11, 9407-9418 (2021). MSC: 41A36 41A25 26A15 PDFBibTeX XMLCite \textit{A. Kajla} et al., Math. Methods Appl. Sci. 44, No. 11, 9407--9418 (2021; Zbl 1470.41020) Full Text: DOI
Mishra, Nav Shakti; Deo, Naokant On the preservation of functions with exponential growth by modified Ismail-May operators. (English) Zbl 1470.41009 Math. Methods Appl. Sci. 44, No. 11, 9012-9025 (2021). MSC: 41A25 41A36 PDFBibTeX XMLCite \textit{N. S. Mishra} and \textit{N. Deo}, Math. Methods Appl. Sci. 44, No. 11, 9012--9025 (2021; Zbl 1470.41009) Full Text: DOI
Usta, Fuat; İlkhan, Merve; Kara, Emrah Evren Numerical solution of Volterra integral equations via Szász-Mirakyan approximation method. (English) Zbl 1490.65321 Math. Methods Appl. Sci. 44, No. 9, 7491-7500 (2021). MSC: 65R20 45D05 41A36 PDFBibTeX XMLCite \textit{F. Usta} et al., Math. Methods Appl. Sci. 44, No. 9, 7491--7500 (2021; Zbl 1490.65321) Full Text: DOI
Kadak, Uğur; Özlük, Muharrem Extended Bernstein-Kantorovich-Stancu operators with multiple parameters and approximation properties. (English) Zbl 1479.41005 Numer. Funct. Anal. Optim. 42, No. 5, 523-550 (2021). Reviewer: Hüseyin Çakallı (Istanbul) MSC: 41A10 41A25 41A36 PDFBibTeX XMLCite \textit{U. Kadak} and \textit{M. Özlük}, Numer. Funct. Anal. Optim. 42, No. 5, 523--550 (2021; Zbl 1479.41005) Full Text: DOI
Alemdar, Meryem Ece; Duman, Oktay General summability methods in the approximation by Bernstein-Chlodovsky operators. (English) Zbl 1478.40003 Numer. Funct. Anal. Optim. 42, No. 5, 497-509 (2021). MSC: 40C05 41A36 41A25 PDFBibTeX XMLCite \textit{M. E. Alemdar} and \textit{O. Duman}, Numer. Funct. Anal. Optim. 42, No. 5, 497--509 (2021; Zbl 1478.40003) Full Text: DOI
Xie, Linsen; Xie, Tingfan; Du, Hong Approximation theorems for localized Baskakov operators. (English) Zbl 1470.41024 Numer. Funct. Anal. Optim. 42, No. 4, 396-408 (2021). Reviewer: D. K. Ugulava (Tbilisi) MSC: 41A36 41A25 PDFBibTeX XMLCite \textit{L. Xie} et al., Numer. Funct. Anal. Optim. 42, No. 4, 396--408 (2021; Zbl 1470.41024) Full Text: DOI
Altomare, Francesco On the convergence of sequences of positive linear operators and functionals on bounded function spaces. (English) Zbl 1511.41011 Proc. Am. Math. Soc. 149, No. 9, 3837-3848 (2021). MSC: 41A36 60B12 PDFBibTeX XMLCite \textit{F. Altomare}, Proc. Am. Math. Soc. 149, No. 9, 3837--3848 (2021; Zbl 1511.41011) Full Text: DOI
Cai, Qing-Bo; Yazıcı, Serdal; Çekım, Bayram; İçöz, Gürhan Quantitative Dunkl analogue of Szász-Mirakyan operators. (English) Zbl 1468.41009 J. Math. Inequal. 15, No. 2, 861-878 (2021). MSC: 41A36 41A25 PDFBibTeX XMLCite \textit{Q.-B. Cai} et al., J. Math. Inequal. 15, No. 2, 861--878 (2021; Zbl 1468.41009) Full Text: DOI
Çetin, Nursel; Acu, Ana-Maria Approximation by \(\alpha\)-Bernstein-Schurer-Stancu operators. (English) Zbl 1471.41011 J. Math. Inequal. 15, No. 2, 845-860 (2021). Reviewer: Ioan Raşa (Cluj-Napoca) MSC: 41A36 41A10 41A25 PDFBibTeX XMLCite \textit{N. Çetin} and \textit{A.-M. Acu}, J. Math. Inequal. 15, No. 2, 845--860 (2021; Zbl 1471.41011) Full Text: DOI
Yu, Kan; Cheng, Wentao; Fan, Ligang; Zhou, Xiaoling Approximation properties of modified Kantorovich type \((p,q)\)-Bernstein operators. (English) Zbl 1468.41010 J. Math. Inequal. 15, No. 2, 547-558 (2021). MSC: 41A36 41A10 41A25 PDFBibTeX XMLCite \textit{K. Yu} et al., J. Math. Inequal. 15, No. 2, 547--558 (2021; Zbl 1468.41010) Full Text: DOI
Wu, Yun-Shun; Cheng, Wen-Tao; Zhou, Wei-Ping; Deng, Lun-Zhi Approximation properties of new modified gamma operators. (English) Zbl 1471.41012 J. Funct. Spaces 2021, Article ID 6696979, 10 p. (2021). Reviewer: Ioan Raşa (Cluj-Napoca) MSC: 41A36 41A81 PDFBibTeX XMLCite \textit{Y.-S. Wu} et al., J. Funct. Spaces 2021, Article ID 6696979, 10 p. (2021; Zbl 1471.41012) Full Text: DOI
Cai, Qing-Bo; Torun, Gülten; Dinlemez Kantar, Ülkü Approximation properties of generalized \(\lambda\)-Bernstein-Stancu-type operators. (English) Zbl 1477.41008 J. Math. 2021, Article ID 5590439, 17 p. (2021). MSC: 41A25 41A36 41A35 PDFBibTeX XMLCite \textit{Q.-B. Cai} et al., J. Math. 2021, Article ID 5590439, 17 p. (2021; Zbl 1477.41008) Full Text: DOI
Jena, Bidu Bhusan; Paikray, Susanta Kumar Statistical convergence of martingale difference sequence via deferred weighted mean and Korovkin-type theorems. (English) Zbl 1474.40012 Miskolc Math. Notes 22, No. 1, 273-286 (2021). MSC: 40A35 40G15 41A36 PDFBibTeX XMLCite \textit{B. B. Jena} and \textit{S. K. Paikray}, Miskolc Math. Notes 22, No. 1, 273--286 (2021; Zbl 1474.40012) Full Text: DOI
Agratini, Octavian; Aral, Ali Approximation of some classes of functions by Landau type operators. (English) Zbl 1468.41007 Result. Math. 76, No. 1, Paper No. 12, 15 p. (2021). Reviewer: Hüseyin Çakallı (Istanbul) MSC: 41A25 41A36 PDFBibTeX XMLCite \textit{O. Agratini} and \textit{A. Aral}, Result. Math. 76, No. 1, Paper No. 12, 15 p. (2021; Zbl 1468.41007) Full Text: DOI
Altomare, Francesco On positive linear functionals and operators associated with generalized means. (English) Zbl 1514.41015 J. Math. Anal. Appl. 502, No. 2, Article ID 125278, 20 p. (2021). MSC: 41A36 28A12 PDFBibTeX XMLCite \textit{F. Altomare}, J. Math. Anal. Appl. 502, No. 2, Article ID 125278, 20 p. (2021; Zbl 1514.41015) Full Text: DOI
Davidson, Kenneth R.; Kennedy, Matthew Choquet order and hyperrigidity for function systems. (English) Zbl 1478.46008 Adv. Math. 385, Article ID 107774, 30 p. (2021). MSC: 46A55 46L05 41A36 47A20 47A58 47L25 PDFBibTeX XMLCite \textit{K. R. Davidson} and \textit{M. Kennedy}, Adv. Math. 385, Article ID 107774, 30 p. (2021; Zbl 1478.46008) Full Text: DOI arXiv
Acu, Ana-Maria; Buscu, Ioan Cristian; Rasa, Ioan A sequence of Appell polynomials and the associated Jakimovski-Leviatan operators. (English) Zbl 1473.41004 Anal. Math. Phys. 11, No. 2, Paper No. 88, 13 p. (2021). Reviewer: Zoltán Finta (Cluj-Napoca) MSC: 41A36 11B83 65D20 PDFBibTeX XMLCite \textit{A.-M. Acu} et al., Anal. Math. Phys. 11, No. 2, Paper No. 88, 13 p. (2021; Zbl 1473.41004) Full Text: DOI
Aslan, Reşat; İzgi, Aydın Approximation by one and two variables of the Bernstein-Schurer-type operators and associated GBS operators on symmetrical mobile interval. (English) Zbl 1466.41010 J. Funct. Spaces 2021, Article ID 9979286, 12 p. (2021). MSC: 41A36 41A25 PDFBibTeX XMLCite \textit{R. Aslan} and \textit{A. İzgi}, J. Funct. Spaces 2021, Article ID 9979286, 12 p. (2021; Zbl 1466.41010) Full Text: DOI
Gal, Sorin G.; Niculescu, Constantin P. A note on the Choquet type operators. (English) Zbl 1473.41003 Aequationes Math. 95, No. 3, 433-447 (2021). Reviewer: D. K. Ugulava (Tbilisi) MSC: 41A35 41A36 47H07 PDFBibTeX XMLCite \textit{S. G. Gal} and \textit{C. P. Niculescu}, Aequationes Math. 95, No. 3, 433--447 (2021; Zbl 1473.41003) Full Text: DOI arXiv
Acu, Ana-Maria; Başcanbaz-Tunca, Gülen; Rasa, Ioan Differences of positive linear operators on simplices. (English) Zbl 1527.41004 J. Funct. Spaces 2021, Article ID 5531577, 11 p. (2021). MSC: 41A36 PDFBibTeX XMLCite \textit{A.-M. Acu} et al., J. Funct. Spaces 2021, Article ID 5531577, 11 p. (2021; Zbl 1527.41004) Full Text: DOI
Gupta, Vijay Higher order Lupaş-Kantorovich operators and finite differences. (English) Zbl 1466.41011 Rev. R. Acad. Cienc. Exactas Fís. Nat., Ser. A Mat., RACSAM 115, No. 3, Paper No. 100, 16 p. (2021). Reviewer: Zoltán Finta (Cluj-Napoca) MSC: 41A36 41A25 PDFBibTeX XMLCite \textit{V. Gupta}, Rev. R. Acad. Cienc. Exactas Fís. Nat., Ser. A Mat., RACSAM 115, No. 3, Paper No. 100, 16 p. (2021; Zbl 1466.41011) Full Text: DOI
Agratini, Octavian Approximation properties of a family of integral type operators. (English) Zbl 1466.41009 Positivity 25, No. 1, 97-108 (2021). Reviewer: D. K. Ugulava (Tbilisi) MSC: 41A36 41A25 PDFBibTeX XMLCite \textit{O. Agratini}, Positivity 25, No. 1, 97--108 (2021; Zbl 1466.41009) Full Text: DOI
Acu, Ana-Maria; Heilmann, Margareta; Rasa, Ioan Iterates of convolution-type operators. (English) Zbl 1465.41006 Positivity 25, No. 2, 495-506 (2021). Reviewer: Zoltán Finta (Cluj-Napoca) MSC: 41A36 41A25 PDFBibTeX XMLCite \textit{A.-M. Acu} et al., Positivity 25, No. 2, 495--506 (2021; Zbl 1465.41006) Full Text: DOI
Alotaibi, Abdullah Approximation of functions by Dunkl-type generalization of Szász-Durrmeyer operators based on \((p,q)\)-integers. (English) Zbl 1462.41009 J. Funct. Spaces 2021, Article ID 5511610, 8 p. (2021). MSC: 41A35 41A36 PDFBibTeX XMLCite \textit{A. Alotaibi}, J. Funct. Spaces 2021, Article ID 5511610, 8 p. (2021; Zbl 1462.41009) Full Text: DOI
Lin, Zhi-Peng; Cheng, Wen-Tao; Xu, Xiao-Wei Approximation properties of \((p,q)\)-Szász-Mirakjan-Durrmeyer operators. (English) Zbl 1462.41011 J. Funct. Spaces 2021, Article ID 6649570, 9 p. (2021). MSC: 41A36 41A10 41A25 PDFBibTeX XMLCite \textit{Z.-P. Lin} et al., J. Funct. Spaces 2021, Article ID 6649570, 9 p. (2021; Zbl 1462.41011) Full Text: DOI
Kumar, Ajay Approximation properties of generalized \(\lambda\)-Bernstein-Kantorovich type operators. (English) Zbl 1465.41007 Rend. Circ. Mat. Palermo (2) 70, No. 1, 505-520 (2021). MSC: 41A36 26A15 40A35 41A25 PDFBibTeX XMLCite \textit{A. Kumar}, Rend. Circ. Mat. Palermo (2) 70, No. 1, 505--520 (2021; Zbl 1465.41007) Full Text: DOI
Daher, Radouan; Tyr, Othman Modulus of smoothness and theorems concerning approximation in the space \(L^2_{q,\alpha}(\mathbb{R}_q)\) with power weight. (English) Zbl 1467.41009 Mediterr. J. Math. 18, No. 2, Paper No. 69, 16 p. (2021). MSC: 41A36 33D15 44A20 PDFBibTeX XMLCite \textit{R. Daher} and \textit{O. Tyr}, Mediterr. J. Math. 18, No. 2, Paper No. 69, 16 p. (2021; Zbl 1467.41009) Full Text: DOI
Khan, Asif; Mansoori, M. S.; Khan, Khalid; Mursaleen, M. Phillips-type \(q\)-Bernstein operators on triangles. (English) Zbl 1462.41010 J. Funct. Spaces 2021, Article ID 6637893, 13 p. (2021). MSC: 41A36 PDFBibTeX XMLCite \textit{A. Khan} et al., J. Funct. Spaces 2021, Article ID 6637893, 13 p. (2021; Zbl 1462.41010) Full Text: DOI
Söylemez, Dilek; Ünver, Mehmet Rates of power series statistical convergence of positive linear operators and power series statistical convergence of \(q\)-Meyer-König and Zeller operators. (English) Zbl 1472.40004 Lobachevskii J. Math. 42, No. 2, 426-434 (2021). MSC: 40A35 40J05 41A36 PDFBibTeX XMLCite \textit{D. Söylemez} and \textit{M. Ünver}, Lobachevskii J. Math. 42, No. 2, 426--434 (2021; Zbl 1472.40004) Full Text: DOI
Acu, Ana-Maria; Başcanbaz-Tunca, Gülen; Rasa, Ioan Information potential for some probability density functions. (English) Zbl 1465.94032 Appl. Math. Comput. 389, Article ID 125578, 15 p. (2021). Reviewer: Jaak Henno (Tallinn) MSC: 94A17 60E05 41A36 41A15 PDFBibTeX XMLCite \textit{A.-M. Acu} et al., Appl. Math. Comput. 389, Article ID 125578, 15 p. (2021; Zbl 1465.94032) Full Text: DOI
Agratini, Octavian; Gal, Sorin G. On Landau-type approximation operators. (English) Zbl 1464.41008 Mediterr. J. Math. 18, No. 2, Paper No. 64, 15 p. (2021). Reviewer: Ioan Raşa (Cluj-Napoca) MSC: 41A36 41A25 41A17 PDFBibTeX XMLCite \textit{O. Agratini} and \textit{S. G. Gal}, Mediterr. J. Math. 18, No. 2, Paper No. 64, 15 p. (2021; Zbl 1464.41008) Full Text: DOI
Agrawal, P. N.; Chauhan, Ruchi Linear positive operators involving orthogonal polynomials. (English) Zbl 1455.41004 Dutta, Hemen (ed.), Topics in contemporary mathematical analysis and applications. Boca Raton, FL: CRC Press (ISBN 978-0-367-53266-6/hbk; 978-1-003-08119-7/ebook). Mathematics and its Applications: Modelling, Engineering, and Social Sciences, 49-76 (2021). MSC: 41A36 41-02 PDFBibTeX XMLCite \textit{P. N. Agrawal} and \textit{R. Chauhan}, in: Topics in contemporary mathematical analysis and applications. Boca Raton, FL: CRC Press. 49--76 (2021; Zbl 1455.41004) Full Text: DOI
Özger, Faruk; Demirci, Kamil; Yıldız, Sevda Approximation by Kantorovich variant of \(\lambda\)-Schurer operators and related numerical results. (English) Zbl 1455.41005 Dutta, Hemen (ed.), Topics in contemporary mathematical analysis and applications. Boca Raton, FL: CRC Press (ISBN 978-0-367-53266-6/hbk; 978-1-003-08119-7/ebook). Mathematics and its Applications: Modelling, Engineering, and Social Sciences, 77-94 (2021). MSC: 41A36 41A25 PDFBibTeX XMLCite \textit{F. Özger} et al., in: Topics in contemporary mathematical analysis and applications. Boca Raton, FL: CRC Press. 77--94 (2021; Zbl 1455.41005) Full Text: DOI
Xiang, Jim X. Voronovskaja-type theorem for modified Bernstein operators. (English) Zbl 1473.41006 J. Math. Anal. Appl. 495, No. 2, Article ID 124728, 12 p. (2021). MSC: 41A36 41A10 PDFBibTeX XMLCite \textit{J. X. Xiang}, J. Math. Anal. Appl. 495, No. 2, Article ID 124728, 12 p. (2021; Zbl 1473.41006) Full Text: DOI
Păltănea, Radu; Smuc, Mihaela Quantitative results for the limiting semigroup generated by the multidimensional Bernstein operators. (English) Zbl 1465.41008 Semigroup Forum 102, No. 1, 235-249 (2021). Reviewer: Zoltán Finta (Cluj-Napoca) MSC: 41A36 20M20 41A10 41A25 47A58 47D06 PDFBibTeX XMLCite \textit{R. Păltănea} and \textit{M. Smuc}, Semigroup Forum 102, No. 1, 235--249 (2021; Zbl 1465.41008) Full Text: DOI
Acu, Ana-Maria; Rasa, Ioan Elementary hypergeometric functions, Heun functions, and moments of MKZ operators. (English) Zbl 1461.33002 Rev. R. Acad. Cienc. Exactas Fís. Nat., Ser. A Mat., RACSAM 115, No. 1, Paper No. 20, 10 p. (2021). MSC: 33C05 33C90 33E30 41A36 PDFBibTeX XMLCite \textit{A.-M. Acu} and \textit{I. Rasa}, Rev. R. Acad. Cienc. Exactas Fís. Nat., Ser. A Mat., RACSAM 115, No. 1, Paper No. 20, 10 p. (2021; Zbl 1461.33002) Full Text: DOI arXiv