Edit Profile Natkaniec, Tomasz Compute Distance To: Compute Author ID: natkaniec.tomasz Published as: Natkaniec, T.; Natkaniec, Tamasz; Natkaniec, Tomasz Homepage: https://mat.ug.edu.pl/~mattn/ External Links: MGP · Wikidata · ResearchGate · dblp Documents Indexed: 91 Publications since 1984, including 1 Book Reviewing Activity: 349 Reviews all top 5 Co-Authors 41 single-authored 8 Ciesielski, Krzysztof Chris 5 Szuca, Piotr 4 Grande, Zbigniew 3 Balcerzak, Marek 3 Gibson, Richard G. jun. 3 Jastrzȩbski, Jan M. 3 Recław, Ireneusz 2 Bartoszewicz, Artur 2 Dogoński, Antoni 2 Filipów, Rafał 2 Jedrzejewski, Jacek Marek 2 Katafiasz, Aleksandra 2 Kirchheim, Bernd 2 Orwat, Waldemar 2 Rosen, Harvey 2 Sieg, Waldemar 2 Terepeta, Małgorzata 2 Wesołowska, Jolanta 1 Banaszewski, Krzysztof 1 Behrends, Ehrhard 1 Bienias, Marek 1 Darji, Udayan B. 1 Dorais, François Gilbert 1 Filipczak, Małgorzata 1 Fremlin, David H. 1 Gámez-Merino, José Luis 1 Geschke, Stefan 1 Głąb, Szymon 1 Gruenhage, Gary F. 1 Matusik, Grzegorz 1 Molenda, Agata 1 Piotrowski, Zbigniew P. 1 Seoane-Sepúlveda, Juan Benigno 1 Skvortsov, Valentin Anatol’evich 1 Strońska, Ewa 1 Wilczyński, Władysław 1 Wódka, Julia 1 Wojciechowski, Jerzy 1 Zagozda, Małgorzata 1 Zglinicka, Małgorzata all top 5 Serials 34 Real Analysis Exchange 7 Zeszyty Naukowe Wyższej Szkoly Pedagogicznej w Bydgoszczy. Problemy Matematyczne 6 Fundamenta Mathematicae 6 Topology and its Applications 4 Mathematica Slovaca 4 Acta Mathematica Hungarica 4 Bulletin of the Polish Academy of Sciences, Mathematics 3 Journal of Mathematical Analysis and Applications 2 European Journal of Mathematics 1 Acta Universitatis Carolinae. Mathematica et Physica 1 Acta Scientiarum Mathematicarum 1 Časopis Pro Pěstování Matematiky 1 Colloquium Mathematicum 1 Commentationes Mathematicae Universitatis Carolinae 1 Czechoslovak Mathematical Journal 1 Publicationes Mathematicae 1 Mathematica Pannonica 1 Acta Mathematica Universitatis Comenianae. New Series 1 Atti del Seminario Matematico e Fisico dell’Università di Modena 1 Linear Algebra and its Applications 1 Archive for Mathematical Logic 1 Tatra Mountains Mathematical Publications 1 Topology Proceedings 1 Zeszyty Naukowe Politechniki Łódzkiej. Matematyka 1 Turkish Journal of Mathematics 1 Georgian Mathematical Journal 1 Central European Journal of Mathematics all top 5 Fields 76 Real functions (26-XX) 44 General topology (54-XX) 20 Mathematical logic and foundations (03-XX) 16 Measure and integration (28-XX) 8 Sequences, series, summability (40-XX) 6 Linear and multilinear algebra; matrix theory (15-XX) 2 Order, lattices, ordered algebraic structures (06-XX) 2 Functional analysis (46-XX) 1 General and overarching topics; collections (00-XX) 1 History and biography (01-XX) 1 Topological groups, Lie groups (22-XX) 1 Dynamical systems and ergodic theory (37-XX) 1 Operator theory (47-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH 50 Publications have been cited 214 times in 127 Documents Cited by ▼ Year ▼ Almost continuity. Zbl 0760.54007Natkaniec, T. 22 1992 Darboux like functions. Zbl 0942.26004Gibson, Richard G.; Natkaniec, Tomasz 15 1997 Algebraic properties of the class of Sierpiński-Zygmund functions. Zbl 0890.26002Ciesielski, Krzysztof; Natkaniec, Tomasz 15 1997 Universally Kuratowski-Ulam spaces. Zbl 0959.54010Fremlin, David; Natkaniec, Tomasz; Recław, Ireneusz 13 2000 Sierpiński-Zygmund functions that are Darboux, almost continuous, or have a perfect road. Zbl 0905.26001Balcerzak, Marek; Ciesielski, Krzysztof; Natkaniec, Tomasz 13 1997 On Smital properties. Zbl 1232.22003Bartoszewicz, Artur; Filipczak, Małgorzata; Natkaniec, Tomasz 11 2011 New cardinal invariants in real analysis. Zbl 0876.26004Natkaniec, Tomasz 10 1996 Algebraic structures in the sets of surjective functions. Zbl 1348.46051Bartoszewicz, Artur; Bienias, Marek; Głąb, Szymon; Natkaniec, Tomasz 9 2016 On the ideal convergence of sequences of quasi-continuous functions. Zbl 1358.54015Natkaniec, Tomasz; Szuca, Piotr 7 2016 Lattices generated by \({\mathcal T}\)-quasi-continuous functions. Zbl 0623.26004Grande, Zbigniew; Natkaniec, Tomasz 7 1986 Algebrability of some families of Darboux-like functions. Zbl 1305.15009Natkaniec, Tomasz 6 2013 Functions for which all points are local extrema. Zbl 1170.26002Behrends, Ehrhard; Geschke, Stefan; Natkaniec, Tomasz 5 2008 On Sierpiński-Zygmund bijections and their inverses. Zbl 0924.26003Ciesielski, Krzysztof; Natkaniec, Tomasz 5 1997 On I-continuity and I-semicontinuity points. Zbl 0608.54005Natkaniec, Tomasz 5 1986 On functions that are almost continuous and perfectly everywhere surjective but not Jones. Lineability and additivity. Zbl 1384.26016Ciesielski, K. C.; Gámez-Merino, J. L.; Natkaniec, T.; Seoane-Sepúlveda, J. B. 4 2018 Sets of ideal convergence of sequences of quasi-continuous functions. Zbl 1321.40004Natkaniec, Tomasz; Wesołowska, Jolanta 4 2015 On Pawlak’s problem concerning entropy of almost continuous functions. Zbl 1206.26003Natkaniec, Tomasz; Szuca, Piotr 4 2010 On thin, very thin, and slim dense sets. Zbl 1115.54004Gruenhage, Gary; Natkaniec, Tomasz; Piotrowski, Zbigniew 4 2007 An example of an additive almost continuous Sierpiński-Zygmund function. Zbl 1060.26004Natkaniec, Tomasz; Rosen, Harvey 4 2005 On the maximum and the minimum of quasi-continuous functions. Zbl 0789.54021Natkaniec, Tomasz 4 1992 Ideal convergence. Zbl 1334.40006Filipów, Rafał; Natkaniec, Tomasz; Szuca, Piotr 3 2013 On some properties of Hamel bases and their applications to Marczewski measurable functions. Zbl 1259.28005Dorais, François G.; Filipów, Rafał; Natkaniec, Tomasz 2 2013 On additive countably continuous functions. Zbl 1274.26007Natkaniec, Tomasz 2 2011 Additive Sierpiński-Zygmund functions. Zbl 1110.26002Natkaniec, Tomasz; Rosen, Harvey 2 2006 Sums of periodic Darboux functions and measurability. Zbl 1221.26004Natkaniec, Tomasz; Wilczyński, Władysław 2 2003 A big symmetric planar set with small category projections. Zbl 1059.03050Ciesielski, Krzysztof; Natkaniec, Tomasz 2 2003 On the convergence of \(\omega_1\) sequences of real functions. Zbl 0980.26001Natkaniec, T.; Wesołowska, J. 2 2001 Extending connectivity functions on \(\mathbb{R}^n\). Zbl 0982.26008Ciesielski, Krzysztof; Natkaniec, Tomasz; Wojciechowski, Jerzy 2 2001 Sierpiński-Zygmund functions that have the Cantor intermediate value property. Zbl 0967.26002Banaszewski, Krzysztof; Natkaniec, Tomasz 2 1999 Darboux like functions. Old problems and new results. Zbl 0969.26003Gibson, Richard G.; Natkaniec, Tomasz 2 1999 On quasi-continuous functions having Darboux property. Zbl 0767.26005Natkaniec, Tomasz 2 1992 Almost continuity. Zbl 0779.54011Natkaniec, Tomasz 2 1992 On quasi-continuous bijections. Zbl 0732.26005Grande, Z.; Natkaniec, T. 2 1991 On some subclasses of Darboux functions. Zbl 0749.26003Jastrzebski, J. M.; Jedrzejewski, J. M.; Natkaniec, T. 2 1991 On universally bad Darboux functions. Zbl 0742.26010Kirchheim, Bernd; Natkaniec, Tomasz 2 1991 Products of quasi-continuous functions. Zbl 0755.26002Natkaniec, Tomasz 2 1990 On the discrete ideal convergence of sequences of quasi-continuous functions. Zbl 1399.40013Natkaniec, T.; Szuca, P. 1 2017 Covering an additive function by \(< \mathfrak c\)-many continuous functions. Zbl 1235.26004Natkaniec, Tomasz 1 2012 Cardinal inequalities implying maximal resolvability. Zbl 1121.54008Balcerzak, Marek; Natkaniec, Tomasz; Terepeta, Małgorzata 1 2005 The density topology can be not extraresolvable. Zbl 1083.28002Natkaniec, Tomasz 1 2005 The \(\mathcal I\)-almost constant convergence of sequences of real functions. Zbl 1046.26001Natkaniec, Tomasz 1 2003 \(\omega _1\)-limits of real functions. Zbl 1014.26511Natkaniec, Tomasz 1 2000 \(\kappa \)-to-\(1\) Darboux-like functions. Zbl 0943.26012Ciesielski, Krzysztof; Gibson, Richard G.; Natkaniec, Tomasz 1 1998 Universal summands for families of measurable functions. Zbl 0913.04003Natkaniec, Tomasz; Reclaw, Ireneusz 1 1998 A new variant of Blumberg’s theorem. Zbl 0942.26003Katafiasz, Aleksandra; Natkaniec, Tomasz 1 1997 Extendability and almost continuity. Zbl 0843.26002Natkaniec, Tomasz 1 1996 Cardinal invariants concerning functions whose product is almost continuous. Zbl 0833.26005Natkaniec, Tomasz; Recław, Ireneusz 1 1995 On compositions and products of almost continuous functions. Zbl 0761.26003Natkaniec, Tomasz 1 1991 Algebraic structures generated by d-quasi continuous functions. Zbl 0655.26007Grande, Zbigniew; Natkaniec, Tomasz; Strońska, Ewa 1 1987 On points of qualitative semicontinuity. Zbl 0624.26006Natkaniec, Tomasz 1 1985 On functions that are almost continuous and perfectly everywhere surjective but not Jones. Lineability and additivity. Zbl 1384.26016Ciesielski, K. C.; Gámez-Merino, J. L.; Natkaniec, T.; Seoane-Sepúlveda, J. B. 4 2018 On the discrete ideal convergence of sequences of quasi-continuous functions. Zbl 1399.40013Natkaniec, T.; Szuca, P. 1 2017 Algebraic structures in the sets of surjective functions. Zbl 1348.46051Bartoszewicz, Artur; Bienias, Marek; Głąb, Szymon; Natkaniec, Tomasz 9 2016 On the ideal convergence of sequences of quasi-continuous functions. Zbl 1358.54015Natkaniec, Tomasz; Szuca, Piotr 7 2016 Sets of ideal convergence of sequences of quasi-continuous functions. Zbl 1321.40004Natkaniec, Tomasz; Wesołowska, Jolanta 4 2015 Algebrability of some families of Darboux-like functions. Zbl 1305.15009Natkaniec, Tomasz 6 2013 Ideal convergence. Zbl 1334.40006Filipów, Rafał; Natkaniec, Tomasz; Szuca, Piotr 3 2013 On some properties of Hamel bases and their applications to Marczewski measurable functions. Zbl 1259.28005Dorais, François G.; Filipów, Rafał; Natkaniec, Tomasz 2 2013 Covering an additive function by \(< \mathfrak c\)-many continuous functions. Zbl 1235.26004Natkaniec, Tomasz 1 2012 On Smital properties. Zbl 1232.22003Bartoszewicz, Artur; Filipczak, Małgorzata; Natkaniec, Tomasz 11 2011 On additive countably continuous functions. Zbl 1274.26007Natkaniec, Tomasz 2 2011 On Pawlak’s problem concerning entropy of almost continuous functions. Zbl 1206.26003Natkaniec, Tomasz; Szuca, Piotr 4 2010 Functions for which all points are local extrema. Zbl 1170.26002Behrends, Ehrhard; Geschke, Stefan; Natkaniec, Tomasz 5 2008 On thin, very thin, and slim dense sets. Zbl 1115.54004Gruenhage, Gary; Natkaniec, Tomasz; Piotrowski, Zbigniew 4 2007 Additive Sierpiński-Zygmund functions. Zbl 1110.26002Natkaniec, Tomasz; Rosen, Harvey 2 2006 An example of an additive almost continuous Sierpiński-Zygmund function. Zbl 1060.26004Natkaniec, Tomasz; Rosen, Harvey 4 2005 Cardinal inequalities implying maximal resolvability. Zbl 1121.54008Balcerzak, Marek; Natkaniec, Tomasz; Terepeta, Małgorzata 1 2005 The density topology can be not extraresolvable. Zbl 1083.28002Natkaniec, Tomasz 1 2005 Sums of periodic Darboux functions and measurability. Zbl 1221.26004Natkaniec, Tomasz; Wilczyński, Władysław 2 2003 A big symmetric planar set with small category projections. Zbl 1059.03050Ciesielski, Krzysztof; Natkaniec, Tomasz 2 2003 The \(\mathcal I\)-almost constant convergence of sequences of real functions. Zbl 1046.26001Natkaniec, Tomasz 1 2003 On the convergence of \(\omega_1\) sequences of real functions. Zbl 0980.26001Natkaniec, T.; Wesołowska, J. 2 2001 Extending connectivity functions on \(\mathbb{R}^n\). Zbl 0982.26008Ciesielski, Krzysztof; Natkaniec, Tomasz; Wojciechowski, Jerzy 2 2001 Universally Kuratowski-Ulam spaces. Zbl 0959.54010Fremlin, David; Natkaniec, Tomasz; Recław, Ireneusz 13 2000 \(\omega _1\)-limits of real functions. Zbl 1014.26511Natkaniec, Tomasz 1 2000 Sierpiński-Zygmund functions that have the Cantor intermediate value property. Zbl 0967.26002Banaszewski, Krzysztof; Natkaniec, Tomasz 2 1999 Darboux like functions. Old problems and new results. Zbl 0969.26003Gibson, Richard G.; Natkaniec, Tomasz 2 1999 \(\kappa \)-to-\(1\) Darboux-like functions. Zbl 0943.26012Ciesielski, Krzysztof; Gibson, Richard G.; Natkaniec, Tomasz 1 1998 Universal summands for families of measurable functions. Zbl 0913.04003Natkaniec, Tomasz; Reclaw, Ireneusz 1 1998 Darboux like functions. Zbl 0942.26004Gibson, Richard G.; Natkaniec, Tomasz 15 1997 Algebraic properties of the class of Sierpiński-Zygmund functions. Zbl 0890.26002Ciesielski, Krzysztof; Natkaniec, Tomasz 15 1997 Sierpiński-Zygmund functions that are Darboux, almost continuous, or have a perfect road. Zbl 0905.26001Balcerzak, Marek; Ciesielski, Krzysztof; Natkaniec, Tomasz 13 1997 On Sierpiński-Zygmund bijections and their inverses. Zbl 0924.26003Ciesielski, Krzysztof; Natkaniec, Tomasz 5 1997 A new variant of Blumberg’s theorem. Zbl 0942.26003Katafiasz, Aleksandra; Natkaniec, Tomasz 1 1997 New cardinal invariants in real analysis. Zbl 0876.26004Natkaniec, Tomasz 10 1996 Extendability and almost continuity. Zbl 0843.26002Natkaniec, Tomasz 1 1996 Cardinal invariants concerning functions whose product is almost continuous. Zbl 0833.26005Natkaniec, Tomasz; Recław, Ireneusz 1 1995 Almost continuity. Zbl 0760.54007Natkaniec, T. 22 1992 On the maximum and the minimum of quasi-continuous functions. Zbl 0789.54021Natkaniec, Tomasz 4 1992 On quasi-continuous functions having Darboux property. Zbl 0767.26005Natkaniec, Tomasz 2 1992 Almost continuity. Zbl 0779.54011Natkaniec, Tomasz 2 1992 On quasi-continuous bijections. Zbl 0732.26005Grande, Z.; Natkaniec, T. 2 1991 On some subclasses of Darboux functions. Zbl 0749.26003Jastrzebski, J. M.; Jedrzejewski, J. M.; Natkaniec, T. 2 1991 On universally bad Darboux functions. Zbl 0742.26010Kirchheim, Bernd; Natkaniec, Tomasz 2 1991 On compositions and products of almost continuous functions. Zbl 0761.26003Natkaniec, Tomasz 1 1991 Products of quasi-continuous functions. Zbl 0755.26002Natkaniec, Tomasz 2 1990 Algebraic structures generated by d-quasi continuous functions. Zbl 0655.26007Grande, Zbigniew; Natkaniec, Tomasz; Strońska, Ewa 1 1987 Lattices generated by \({\mathcal T}\)-quasi-continuous functions. Zbl 0623.26004Grande, Zbigniew; Natkaniec, Tomasz 7 1986 On I-continuity and I-semicontinuity points. Zbl 0608.54005Natkaniec, Tomasz 5 1986 On points of qualitative semicontinuity. Zbl 0624.26006Natkaniec, Tomasz 1 1985 all cited Publications top 5 cited Publications all top 5 Cited by 120 Authors 15 Natkaniec, Tomasz 13 Ciesielski, Krzysztof Chris 11 Seoane-Sepúlveda, Juan Benigno 10 Ostaszewski, Adam J. 8 Bingham, Nicholas Hugh 6 Bartoszewicz, Artur 6 Burke, Maxim R. 5 Gámez-Merino, José Luis 5 Głąb, Szymon 4 Jordan, Francis 4 Loranty, Anna 4 Pawlak, Ryszard Jerzy 4 Pellegrino, Daniel Marinho 3 Balcerzak, Marek 3 Bernal-Gonzàlez, Luis 3 Borsík, Ján 3 Filipczak, Małgorzata 3 Kharazishvili, Alexander Bezhanovich 3 Kosman, Jolanta 3 Macheras, Nikolaos Demetrios 3 Modak, Shyamapada 3 Muñoz-Fernández, Gustavo A. 3 Płotka, Krzysztof 3 Sieg, Waldemar 3 Strauss, Werner 3 Szczuka, Paulina 2 Bienias, Marek 2 Fedeli, Alessandro 2 Filipczak, Tomasz 2 Grande, Zbigniew 2 Gruenhage, Gary F. 2 Jordán, Ferenc 2 Korczak-Kubiak, Ewa 2 Kucharski, Andrzej 2 Kwela, Adam 2 Le Donne, Attilio 2 Lindner, Sebastian 2 Maliszewski, Aleksander 2 Musial, Kazimierz 2 Nadler, Sam B. jun. 2 Nesterenko, Vasyl’ V. 2 Sáez-Maestro, Eva 2 Spadaro, Santi 2 Staniszewski, Marcin 2 Storozhuk, Konstantin Valer’evich 2 Szuca, Piotr 2 Terepeta, Małgorzata 2 Wódka, Julia 2 Wojciechowski, Jerzy 1 Albkwre, Gbrel M. 1 Alikhani-Koopaei, Aliasghar 1 Arutyunov, Aram Vladimirovic 1 Bąkowska, Anna 1 Bella, Angelo 1 Bernardi, Claudio 1 Bonilla, Antonio 1 Cao, Jiling 1 Cheng, Lixin 1 Das, Arkabrata 1 Diniz Pereira da Silva e Silva, Diogo 1 Dorais, François Gilbert 1 Evans, Michael Jon 1 Farkas, Barnabás 1 Vieira Fávaro, Vinícius 1 Fenoy Muñoz, Mar 1 Filipów, Rafał 1 Hamlett, T. R. 1 Hiriart-Urruty, Jean-Baptiste 1 Horbaczewska, Grażyna 1 Hutchison, Jennifer 1 Islam, Md. Monirul 1 Ivanova, Gertruda 1 Jabłońska, Eliza 1 Jabłoński, Wojciech 1 Jiménez-Rodríguez, Pablo 1 Kalemba, Piotr 1 Kamboj, Devender Kumar 1 Karasińska, Aleksandra 1 Keleti, Tamás 1 Kirtadze, Aleks P. 1 Knapik, Rafal 1 Kumar, Vinod 1 Kwiatkowska, Aleksandra 1 Le, Hai Yen 1 Li, Rui 1 Lin, Lihua 1 López-Salazar, Jerónimo 1 Mahmoud, R. A. 1 Matusik, Grzegorz 1 Matveev, Michael V. 1 Mazza, Leonardo 1 Michalski, Marcin 1 Nasef, Arafa A. 1 Nowik, Andrzej 1 Oman, Greg G. 1 Ordóñez Cabrera, Manuel H. 1 Pan, Cheng-Han 1 Pawlikowski, Janusz 1 Plewik, Szymon 1 Popławski, Michał ...and 20 more Authors all top 5 Cited in 44 Serials 35 Topology and its Applications 13 Journal of Mathematical Analysis and Applications 8 Mathematica Slovaca 7 Proceedings of the American Mathematical Society 5 Linear Algebra and its Applications 4 Acta Mathematica Hungarica 3 Bulletin of the Australian Mathematical Society 3 Journal of Applied Analysis 3 Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A: Matemáticas. RACSAM 3 European Journal of Mathematics 2 Lithuanian Mathematical Journal 2 Demonstratio Mathematica 2 Results in Mathematics 2 Aequationes Mathematicae 2 Bulletin of the American Mathematical Society. New Series 2 Expositiones Mathematicae 2 Indagationes Mathematicae. New Series 2 Central European Journal of Mathematics 1 American Mathematical Monthly 1 Rocky Mountain Journal of Mathematics 1 Chaos, Solitons and Fractals 1 Journal of Approximation Theory 1 Journal of Functional Analysis 1 Monatshefte für Mathematik 1 Real Analysis Exchange 1 Rendiconti del Circolo Matemàtico di Palermo. Serie II 1 Siberian Mathematical Journal 1 Archive for Mathematical Logic 1 Journal of Mathematical Sciences (New York) 1 Turkish Journal of Mathematics 1 Georgian Mathematical Journal 1 Top 1 Opuscula Mathematica 1 Acta Mathematica Sinica. English Series 1 Annales Mathematicae Silesianae 1 Proceedings of the National Academy of Sciences, India. Section A. Physical Sciences 1 Missouri Journal of Mathematical Sciences 1 Boletim da Sociedade Paranaense de Matemática. Terceira Série 1 Sarajevo Journal of Mathematics 1 Banach Journal of Mathematical Analysis 1 Asian-European Journal of Mathematics 1 Journal of Function Spaces 1 Open Mathematics 1 Transactions of A. Razmadze Mathematical Institute all top 5 Cited in 25 Fields 76 General topology (54-XX) 63 Real functions (26-XX) 20 Mathematical logic and foundations (03-XX) 19 Linear and multilinear algebra; matrix theory (15-XX) 17 Measure and integration (28-XX) 16 Functional analysis (46-XX) 8 Sequences, series, summability (40-XX) 6 Difference and functional equations (39-XX) 5 Functions of a complex variable (30-XX) 4 Topological groups, Lie groups (22-XX) 4 Dynamical systems and ergodic theory (37-XX) 4 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 3 Approximations and expansions (41-XX) 3 Operator theory (47-XX) 3 Probability theory and stochastic processes (60-XX) 2 Abstract harmonic analysis (43-XX) 2 Global analysis, analysis on manifolds (58-XX) 1 Combinatorics (05-XX) 1 Order, lattices, ordered algebraic structures (06-XX) 1 Number theory (11-XX) 1 Several complex variables and analytic spaces (32-XX) 1 Harmonic analysis on Euclidean spaces (42-XX) 1 Calculus of variations and optimal control; optimization (49-XX) 1 Numerical analysis (65-XX) 1 Relativity and gravitational theory (83-XX) Citations by Year Wikidata Timeline The data are displayed as stored in Wikidata under a Creative Commons CC0 License. Updates and corrections should be made in Wikidata.