Edit Profile Berthelot, Pierre Compute Distance To: Compute Author ID: berthelot.pierre Published as: Berthelot, P.; Berthelot, Pierre Homepage: http://perso.univ-rennes1.fr/pierre.berthelot/ External Links: MGP · Wikidata · GND Documents Indexed: 51 Publications since 1969, including 8 Books all top 5 Co-Authors 36 single-authored 6 Illusie, Luc 4 Messing, William 3 Fontaine, Jean-Marc 3 Kato, Kazuya 3 Rapoport, Michael 2 Baldassarri, Francesco 2 Esnault, Hélène 2 Katz, Nicholas Michael 2 Ogus, Arthur 1 Adolphson, Alan 1 Bloch, Spencer J. 1 Breen, Lawrence S. 1 Grothendieck, Alexander 1 Loeser, François 1 Rülling, Kay 1 Scholze, Peter all top 5 Serials 11 Comptes Rendus Hebdomadaires des Séances de l’Académie des Sciences, Série A 3 Astérisque 3 Lecture Notes in Mathematics 2 Annales Scientifiques de l’École Normale Supérieure. Quatrième Série 2 Bulletin de la Société Mathématique de France 2 Inventiones Mathematicae 2 Mémoires de la Société Mathématique de France. Nouvelle Série 1 Compositio Mathematica 1 Rendiconti del Seminario Matematico della Università di Padova 1 Comptes Rendus de l’Académie des Sciences. Série I 1 Notices of the American Mathematical Society 1 European Mathematical Society Newsletter 1 Comptes Rendus de l’Académie des Sciences. Série I. Mathématique 1 Annals of Mathematics. Second Series 1 Bulletin de la Société Mathématique de France. Supplément. Mémoires all top 5 Fields 46 Algebraic geometry (14-XX) 6 Several complex variables and analytic spaces (32-XX) 5 General and overarching topics; collections (00-XX) 5 Commutative algebra (13-XX) 5 Category theory; homological algebra (18-XX) 4 Number theory (11-XX) 3 Field theory and polynomials (12-XX) 3 Associative rings and algebras (16-XX) 1 History and biography (01-XX) 1 Functional analysis (46-XX) 1 Manifolds and cell complexes (57-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH 45 Publications have been cited 892 times in 565 Documents Cited by ▼ Year ▼ Notes on crystalline cohomology. Zbl 0383.14010Berthelot, Pierre; Ogus, Arthur 156 1978 Séminaire de géométrie algébrique du Bois Marie 1966/67, SGA 6.Dirigé par P. Berthelot, A. Grothendieck et L. Illusie, Avec la collaboration de D. Ferrand, J. P. Jouanolou, O. Jussilia, S. Kleiman, M. Raynaud et J. P. Serre. Théorie des intersections et théorème de Riemann-Roch. Zbl 0218.14001Berthelot, P. (ed.); Grothendieck, A. (ed.); Illusie, L. (ed.) 112 1971 Cohomologie cristalline des schemas de caractéristique \(p >0\). Zbl 0298.14012Berthelot, Pierre 99 1974 Théorie de Dieudonne cristalline. II. Zbl 0516.14015Berthelot, P.; Breen, L.; Messing, W. 71 1982 Arithmetic \({\mathcal D}\)-modules. I: Differential operators of finite level. Zbl 0886.14004Berthelot, Pierre 63 1996 Finiteness and cohomological purity in rigid cohomology (with an appendix by Aise Johan de Jong). Zbl 0908.14005Berthelot, Pierre 54 1997 F-isocrystals and De Rham cohomology. I. Zbl 0516.14017Berthelot, P.; Ogus, A. 46 1983 Géométrie rigide et cohomologie des variétés algébriques de \(caract\acute eristique\quad p\). (Rigid geometry and cohomology of algebraic varieties of \(characteristic\quad p\)). Zbl 0606.14017Berthelot, Pierre 29 1986 \({\mathcal D}\)-modules arithmétiques. II: Descente par Frobenius. (Arithmetic \({\mathcal D}\)-modules. II: Frobenius descent). Zbl 0948.14017Berthelot, Pierre 27 2000 Cohomologie rigide et théorie des \({\mathcal D}\)-modules. (Rigid cohomology and theory of \({\mathcal D}\)-modules). Zbl 0722.14008Berthelot, Pierre 24 1990 Introduction to the arithmetic theory of \(\mathcal D\)-modules. Zbl 1098.14010Berthelot, Pierre 23 2002 Géométrie rigide et cohomologie des variétés algébriques de caractéristique p. Zbl 0515.14015Berthelot, Pierre 22 1983 Théorie de Dieudonné cristalline. III: Théorèmes d’équivalence et de pleine fidélité. (Dieudonné crystalline theory. III: Theorems of equivalence and of full faith). Zbl 0753.14041Berthelot, Pierre; Messing, William 19 1990 On Witt vector cohomology for singular varieties. Zbl 1213.14040Berthelot, Pierre; Bloch, Spencer; Esnault, Hélène 13 2007 Poincaré duality and Künneth formula for rigid cohomology. Zbl 0908.14006Berthelot, Pierre 13 1997 Alterations of algebraic varieties (after A. J. de Jong). Zbl 0924.14007Berthelot, Pierre 13 1997 Classes de Chern en cohomologie cristalline. Zbl 0198.26201Berthelot, P.; Illusie, L. 13 1970 Cohomologie rigide et théorie de Dwork: Le cas des sommes exponentielles. Zbl 0577.14013Berthelot, Pierre 12 1984 Théorie de Dieudonne cristalline. I. Zbl 0414.14014Berthelot, Pierre; Messing, William 11 1979 Théorie de Dieudonne sur un anneau de valuation parfait. Zbl 0441.14012Berthelot, Pierre 8 1980 Cohomologie p-cristalline des schémas: relèvement de la caractéristique p à la caractéristique O. Zbl 0179.26202Berthelot, P. 8 1969 Differential coherence of overconvergent function algebras. Zbl 0871.14014Berthelot, Pierre 7 1996 Le théorème de dualité plate pour les surfaces. (D’apres J. S. Milne). Zbl 0469.14010Berthelot, P. 6 1981 Slopes of Frobenius in crystalline cohomology. Zbl 0323.14008Berthelot, Pierre 6 1975 Sur le ”Théoreme de Lefschetz faible” en cohomologie cristalline. Zbl 0268.14007Berthelot, Pierre 6 1973 On Dwork cohomology for singular hypersurfaces. Zbl 1117.14022Baldassarri, Francesco; Berthelot, Pierre 5 2004 Généralités sur les \(\lambda\)-anneaux. (Generalities on \(\lambda\)- rings). Zbl 0223.14013Berthelot, P. 4 1971 Rational points over finite fields for regular models of algebraic varieties of Hodge type \(\geq 1\). Zbl 1254.14019Berthelot, Pierre; Esnault, Hélène; Rülling, Kay 2 2012 \(p\)-adic cohomology and arithmetic applications (II). Zbl 0990.00020Berthelot, Pierre (ed.); Fontaine, Jean-Marc (ed.); Illusie, Luc (ed.); Kato, Kazuya (ed.); Rapoport, Michael (ed.) 2 2002 Systèmes de Honda des schémas en \(\mathbb{F}_q\)-vectoriels. Zbl 0373.14015Berthelot, Pierre 2 1977 Classe de cohomologie associée á un cycle non singulier en cohomologie cristalline. Zbl 0214.19902Berthelot, P. 2 1971 A note on Frobenius divided modules in mixed characteristics. Zbl 1277.14016Berthelot, Pierre 1 2012 Geometric aspects of Dwork theory. Vol. I, II. Zbl 1047.14001Adolphson, Alan (ed.); Baldassarri, Francesco (ed.); Berthelot, Pierre (ed.); Katz, Nicholas (ed.); Loeser, François (ed.) 1 2004 Classification topologique universelle des singularites, d’apres F. Pham. Zbl 0301.32012Berthelot, Pierre 1 1974 Immersions régulières et calcul du \(K\cdot\) d’un schema eclate. (Regular immersions and calculus of \(K\cdot\) of a blowing up scheme). Zbl 0225.14004Berthelot, Pierre 1 1971 The \(K\cdot\) of a projective fibre: Calculus and consequences. Zbl 0225.14003Berthelot, Pierre 1 1971 The Riemann-Roch theorem. Zbl 0222.14012Berthelot, Pierre 1 1971 Quelques calculs de groupes K. (Some calculus of K-groups). Zbl 0221.14013Berthelot, P. 1 1971 Une formule de rationalité pour la fonction \(\zeta\) des schémas propres et lisses sur un corps fini. Zbl 0214.20001Berthelot, P. 1 1971 Quelques relations entre les Ext cristallins et les Ext des complexes d’opérateurs différentiels d’ordre \(\leq 1\). Zbl 0214.19901Berthelot, P. 1 1971 La dualité de Poincaré en cohomologie cristalline. Zbl 0205.25401Berthelot, P. 1 1971 Sur le morphisme trace en cohomologie cristalline. Zbl 0205.25302Berthelot, P. 1 1971 Cohomologie cristalline locale. Zbl 0205.25301Berthelot, P. 1 1971 Cohomologie p-cristalline des schemas: comparaison avec la cohomologie de de Rham. Zbl 0179.26301Berthelot, P. 1 1969 Cohomologie p-cristalline des schemas: variantes sur les notions de connexion et de stratification. Zbl 0179.26203Berthelot, P. 1 1969 Rational points over finite fields for regular models of algebraic varieties of Hodge type \(\geq 1\). Zbl 1254.14019Berthelot, Pierre; Esnault, Hélène; Rülling, Kay 2 2012 A note on Frobenius divided modules in mixed characteristics. Zbl 1277.14016Berthelot, Pierre 1 2012 On Witt vector cohomology for singular varieties. Zbl 1213.14040Berthelot, Pierre; Bloch, Spencer; Esnault, Hélène 13 2007 On Dwork cohomology for singular hypersurfaces. Zbl 1117.14022Baldassarri, Francesco; Berthelot, Pierre 5 2004 Geometric aspects of Dwork theory. Vol. I, II. Zbl 1047.14001Adolphson, Alan (ed.); Baldassarri, Francesco (ed.); Berthelot, Pierre (ed.); Katz, Nicholas (ed.); Loeser, François (ed.) 1 2004 Introduction to the arithmetic theory of \(\mathcal D\)-modules. Zbl 1098.14010Berthelot, Pierre 23 2002 \(p\)-adic cohomology and arithmetic applications (II). Zbl 0990.00020Berthelot, Pierre (ed.); Fontaine, Jean-Marc (ed.); Illusie, Luc (ed.); Kato, Kazuya (ed.); Rapoport, Michael (ed.) 2 2002 \({\mathcal D}\)-modules arithmétiques. II: Descente par Frobenius. (Arithmetic \({\mathcal D}\)-modules. II: Frobenius descent). Zbl 0948.14017Berthelot, Pierre 27 2000 Finiteness and cohomological purity in rigid cohomology (with an appendix by Aise Johan de Jong). Zbl 0908.14005Berthelot, Pierre 54 1997 Poincaré duality and Künneth formula for rigid cohomology. Zbl 0908.14006Berthelot, Pierre 13 1997 Alterations of algebraic varieties (after A. J. de Jong). Zbl 0924.14007Berthelot, Pierre 13 1997 Arithmetic \({\mathcal D}\)-modules. I: Differential operators of finite level. Zbl 0886.14004Berthelot, Pierre 63 1996 Differential coherence of overconvergent function algebras. Zbl 0871.14014Berthelot, Pierre 7 1996 Cohomologie rigide et théorie des \({\mathcal D}\)-modules. (Rigid cohomology and theory of \({\mathcal D}\)-modules). Zbl 0722.14008Berthelot, Pierre 24 1990 Théorie de Dieudonné cristalline. III: Théorèmes d’équivalence et de pleine fidélité. (Dieudonné crystalline theory. III: Theorems of equivalence and of full faith). Zbl 0753.14041Berthelot, Pierre; Messing, William 19 1990 Géométrie rigide et cohomologie des variétés algébriques de \(caract\acute eristique\quad p\). (Rigid geometry and cohomology of algebraic varieties of \(characteristic\quad p\)). Zbl 0606.14017Berthelot, Pierre 29 1986 Cohomologie rigide et théorie de Dwork: Le cas des sommes exponentielles. Zbl 0577.14013Berthelot, Pierre 12 1984 F-isocrystals and De Rham cohomology. I. Zbl 0516.14017Berthelot, P.; Ogus, A. 46 1983 Géométrie rigide et cohomologie des variétés algébriques de caractéristique p. Zbl 0515.14015Berthelot, Pierre 22 1983 Théorie de Dieudonne cristalline. II. Zbl 0516.14015Berthelot, P.; Breen, L.; Messing, W. 71 1982 Le théorème de dualité plate pour les surfaces. (D’apres J. S. Milne). Zbl 0469.14010Berthelot, P. 6 1981 Théorie de Dieudonne sur un anneau de valuation parfait. Zbl 0441.14012Berthelot, Pierre 8 1980 Théorie de Dieudonne cristalline. I. Zbl 0414.14014Berthelot, Pierre; Messing, William 11 1979 Notes on crystalline cohomology. Zbl 0383.14010Berthelot, Pierre; Ogus, Arthur 156 1978 Systèmes de Honda des schémas en \(\mathbb{F}_q\)-vectoriels. Zbl 0373.14015Berthelot, Pierre 2 1977 Slopes of Frobenius in crystalline cohomology. Zbl 0323.14008Berthelot, Pierre 6 1975 Cohomologie cristalline des schemas de caractéristique \(p >0\). Zbl 0298.14012Berthelot, Pierre 99 1974 Classification topologique universelle des singularites, d’apres F. Pham. Zbl 0301.32012Berthelot, Pierre 1 1974 Sur le ”Théoreme de Lefschetz faible” en cohomologie cristalline. Zbl 0268.14007Berthelot, Pierre 6 1973 Séminaire de géométrie algébrique du Bois Marie 1966/67, SGA 6.Dirigé par P. Berthelot, A. Grothendieck et L. Illusie, Avec la collaboration de D. Ferrand, J. P. Jouanolou, O. Jussilia, S. Kleiman, M. Raynaud et J. P. Serre. Théorie des intersections et théorème de Riemann-Roch. Zbl 0218.14001Berthelot, P. (ed.); Grothendieck, A. (ed.); Illusie, L. (ed.) 112 1971 Généralités sur les \(\lambda\)-anneaux. (Generalities on \(\lambda\)- rings). Zbl 0223.14013Berthelot, P. 4 1971 Classe de cohomologie associée á un cycle non singulier en cohomologie cristalline. Zbl 0214.19902Berthelot, P. 2 1971 Immersions régulières et calcul du \(K\cdot\) d’un schema eclate. (Regular immersions and calculus of \(K\cdot\) of a blowing up scheme). Zbl 0225.14004Berthelot, Pierre 1 1971 The \(K\cdot\) of a projective fibre: Calculus and consequences. Zbl 0225.14003Berthelot, Pierre 1 1971 The Riemann-Roch theorem. Zbl 0222.14012Berthelot, Pierre 1 1971 Quelques calculs de groupes K. (Some calculus of K-groups). Zbl 0221.14013Berthelot, P. 1 1971 Une formule de rationalité pour la fonction \(\zeta\) des schémas propres et lisses sur un corps fini. Zbl 0214.20001Berthelot, P. 1 1971 Quelques relations entre les Ext cristallins et les Ext des complexes d’opérateurs différentiels d’ordre \(\leq 1\). Zbl 0214.19901Berthelot, P. 1 1971 La dualité de Poincaré en cohomologie cristalline. Zbl 0205.25401Berthelot, P. 1 1971 Sur le morphisme trace en cohomologie cristalline. Zbl 0205.25302Berthelot, P. 1 1971 Cohomologie cristalline locale. Zbl 0205.25301Berthelot, P. 1 1971 Classes de Chern en cohomologie cristalline. Zbl 0198.26201Berthelot, P.; Illusie, L. 13 1970 Cohomologie p-cristalline des schémas: relèvement de la caractéristique p à la caractéristique O. Zbl 0179.26202Berthelot, P. 8 1969 Cohomologie p-cristalline des schemas: comparaison avec la cohomologie de de Rham. Zbl 0179.26301Berthelot, P. 1 1969 Cohomologie p-cristalline des schemas: variantes sur les notions de connexion et de stratification. Zbl 0179.26203Berthelot, P. 1 1969 all cited Publications top 5 cited Publications all top 5 Cited by 458 Authors 17 Caro, Daniel 10 Gros, Michel 10 Ogus, Arthur 9 Chiarellotto, Bruno 8 Berthelot, Pierre 8 Le Stum, Bernard 7 Abe, Tomoyuki 7 Andreatta, Fabrizio 7 Gillet, Henri A. 7 Kato, Kazuya 7 Narváez-Macarro, Luis 7 Tsuzuki, Nobuo 6 Crew, Richard M. 6 Etesse, Jean-Yves 6 Huyghe, Christine 6 Messing, William 6 Nygaard, Niels O. 6 Olsson, Martin C. 6 Pappas, Georgios 6 Quirós Gracián, Adolfo 6 Scholze, Peter 6 Trihan, Fabien 6 Vasiu, Adrian 5 Besser, Amnon 5 Breuil, Christophe 5 de Jong, Aise Johan 5 Esnault, Hélène 5 Große-Klönne, Elmar 5 Illusie, Luc 5 Lazda, Christopher 5 Mebkhout, Zoghman 5 Schmidt, Tobias 5 Thomason, Robert Wayne 4 Bhatt, Bhargav 4 Fulton, William 4 Hattori, Shin 4 Howard, Benjamin 4 Kim, Wansu 4 Lan, Kai-Wen 4 Lieblich, Max David 4 Morrow, Matthew 4 Rössler, Damian Charles 3 André, Yves 3 Ardakov, Konstantin 3 Bannai, Kenichi 3 Bloch, Spencer J. 3 Cadoret, Anna 3 Chatzistamatiou, Andre 3 Conrad, Brian 3 Cortiñas, Guillermo H. 3 Ekedahl, Torsten 3 Ertl, Veronika 3 Fiorot, Luisa 3 Hamacher, Paul 3 Iovita, Adrian 3 Jannsen, Uwe 3 Katz, Nicholas Michael 3 Kim, Minhyong 3 Kisin, Mark 3 Kleiman, Steven Lawrence 3 Lau, Eike 3 Li, Kezheng 3 Madapusi Pera, Keerthi 3 Nizioł, Wiesława 3 Orlov, Dmitri O. 3 Schoen, Chad 3 Schröer, Stefan 3 Shiho, Atsushi 3 Soulé, Christophe 3 Strauch, Matthias 3 Tabuada, Gonçalo 3 Tamagawa, Akio 3 Tamme, Georg 3 Taylor, Richard Lawrence 3 Tian, Yichao 3 Tsuji, Takeshi 3 Vistoli, Angelo 3 Wadsley, Simon J. 3 Weibel, Charles A. 3 Zink, Thomas 2 Altman, Allen B. 2 Baldassarri, Francesco 2 Barbieri Viale, Luca 2 Baum, Paul Frank 2 Bertapelle, Alessandra 2 Bitoun, Thomas 2 Bost, Jean-Benoît 2 Breen, Lawrence S. 2 Brinon, Olivier 2 Cais, Bryden 2 Cheng, Chuangxun 2 Chinburg, Ted 2 Christol, Gilles 2 Coleman, Robert Frederick 2 Cuntz, Joachim 2 Déglise, Frédéric 2 Deligne, Pierre René 2 Dolgachev, Igor’ Vladimirovich 2 Fontaine, Jean-Marc 2 Garnier, Lionel ...and 358 more Authors all top 5 Cited in 90 Serials 43 Compositio Mathematica 40 Duke Mathematical Journal 35 Inventiones Mathematicae 34 Journal of Algebra 26 Annales de l’Institut Fourier 23 Advances in Mathematics 23 Mathematische Annalen 21 Annales Scientifiques de l’École Normale Supérieure. Quatrième Série 21 Rendiconti del Seminario Matematico della Università di Padova 15 Bulletin de la Société Mathématique de France 15 Journal of Pure and Applied Algebra 15 Mathematische Zeitschrift 14 Annals of Mathematics. Second Series 13 Publications Mathématiques 12 Journal of Number Theory 12 Transactions of the American Mathematical Society 11 Journal für die Reine und Angewandte Mathematik 11 Documenta Mathematica 10 Journal of the American Mathematical Society 10 Journal of Algebraic Geometry 9 Publications of the Research Institute for Mathematical Sciences, Kyoto University 7 Manuscripta Mathematica 7 Nagoya Mathematical Journal 7 Journal of the Institute of Mathematics of Jussieu 6 Journal de Théorie des Nombres de Bordeaux 6 Selecta Mathematica. New Series 5 Israel Journal of Mathematics 5 Tohoku Mathematical Journal. Second Series 4 Comptes Rendus. Mathématique. Académie des Sciences, Paris 4 Forum of Mathematics, Sigma 3 Journal of Geometry and Physics 3 Journal of Soviet Mathematics 3 \(K\)-Theory 3 Mémoires de la Société Mathématique de France. Nouvelle Série 3 Annales de la Faculté des Sciences de Toulouse. Mathématiques. Série VI 3 Research in the Mathematical Sciences 3 Tunisian Journal of Mathematics 2 Nuclear Physics. B 2 Rocky Mountain Journal of Mathematics 2 Arkiv för Matematik 2 Acta Mathematica 2 Mathematische Nachrichten 2 Michigan Mathematical Journal 2 Revista Matemática Iberoamericana 2 Journal of the European Mathematical Society (JEMS) 2 Central European Journal of Mathematics 2 International Journal of Number Theory 2 Algebra & Number Theory 2 Japanese Journal of Mathematics. 3rd Series 1 Communications in Mathematical Physics 1 Discrete Mathematics 1 Mathematical Proceedings of the Cambridge Philosophical Society 1 Mathematics of Computation 1 Geometriae Dedicata 1 Illinois Journal of Mathematics 1 Journal of the Mathematical Society of Japan 1 The Journal of Symbolic Logic 1 Kodai Mathematical Journal 1 Memoirs of the American Mathematical Society 1 Notre Dame Journal of Formal Logic 1 Pacific Journal of Mathematics 1 Proceedings of the American Mathematical Society 1 Results in Mathematics 1 Journal of Complexity 1 Annales Scientifiques de l’Université Blaise Pascal Clermont-Ferrand II. Mathématiques 1 International Journal of Mathematics 1 Bulletin of the American Mathematical Society. New Series 1 Applied Categorical Structures 1 St. Petersburg Mathematical Journal 1 Finite Fields and their Applications 1 Transformation Groups 1 Representation Theory 1 Geometry & Topology 1 Algebras and Representation Theory 1 Revista Matemática Complutense 1 LMS Journal of Computation and Mathematics 1 Acta Mathematica Sinica. English Series 1 Portugaliae Mathematica. Nova Série 1 SIGMA. Symmetry, Integrability and Geometry: Methods and Applications 1 Bulletin de la Société Mathématique de France. Supplément. Mémoires 1 Chebyshevskiĭ Sbornik 1 Mathematics in Computer Science 1 Journal of Noncommutative Geometry 1 Science China. Mathematics 1 \(p\)-Adic Numbers, Ultrametric Analysis, and Applications 1 Annales Universitatis Paedagogicae Cracoviensis. Studia Mathematica 1 Kyoto Journal of Mathematics 1 European Journal of Mathematics 1 Journal de l’École Polytechnique – Mathématiques 1 Annales Henri Lebesgue all top 5 Cited in 27 Fields 491 Algebraic geometry (14-XX) 160 Number theory (11-XX) 63 Commutative algebra (13-XX) 51 \(K\)-theory (19-XX) 39 Category theory; homological algebra (18-XX) 30 Field theory and polynomials (12-XX) 29 Several complex variables and analytic spaces (32-XX) 24 Associative rings and algebras (16-XX) 24 Group theory and generalizations (20-XX) 17 Algebraic topology (55-XX) 8 Global analysis, analysis on manifolds (58-XX) 7 Nonassociative rings and algebras (17-XX) 6 Topological groups, Lie groups (22-XX) 6 Differential geometry (53-XX) 4 Combinatorics (05-XX) 4 Special functions (33-XX) 4 Functional analysis (46-XX) 4 Manifolds and cell complexes (57-XX) 3 Dynamical systems and ergodic theory (37-XX) 2 Ordinary differential equations (34-XX) 2 Abstract harmonic analysis (43-XX) 2 Quantum theory (81-XX) 1 General and overarching topics; collections (00-XX) 1 Mathematical logic and foundations (03-XX) 1 Linear and multilinear algebra; matrix theory (15-XX) 1 Operator theory (47-XX) 1 Geometry (51-XX) Citations by Year Wikidata Timeline The data are displayed as stored in Wikidata under a Creative Commons CC0 License. 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