English Version


Data si locul nasterii: 14.07.1960, Bucuresti.

Studii: Facultatea de Matematica, Universitatea din Bucuresti (licenta 1984, specializare in algebra-geometrie 1985).
Doctorat: 1993, Universitatea din Bucuresti, cu teza "Structuri geometrice pe varietati complexe. Structuri local conform Kaehler" (indrumator Prof.dr. S. Ianus).
Pozitii academice: Asistent (1990-1995), Lector (1995-2000), Conferentiar (2000-2004), profesor (2004-prezent).
Pozitii de cercetare: Cerc. st. I la Institutul de Matematica "Simion Stoilow" al Academiei Romane (2007-prezent).
Cursuri predate la Facultatea de Matematica si la SNSB: Geometrie, Geometrie diferentiala, Topologie algebrica, Calcul variational in geometria riemanniana, Geometrie simplectica, Geometrie complexa, Concepte algebrice in geometrie.
Profesor/cercetator vizitator: "Max Planck" Inst. (Bonn), Ecole Polytechnique (Paris), ICTP (Trieste), "Erwin Schroedinger" Inst. (Viena), University of New Mexico (Albuquerque), Univ. din Roma "La Sapienza", Ecole Polytechnique Federale de Lausanne, Tokyo Metropolitan Univ. etc.
Domeniul de cercetare: Geometria diferentiala.
Premiul "Gheorghe Titeica" al Academiei Romane in 1998 pentru cartea "Locally conformal Kaehler geometry" (Birkhauser).


 Pentru informatii complete: pagina personala

Carti si manuale

  1. Curbe si suprafete diferentiabile (culegere de probleme), Ed. Universitatii Bucuresti, 1995.
  2. Locally conformal Kähler geometry, Progress in Math. 155, Birkhuäser, (1998) (cu Sorin Dragomir). MR99a:53081.
  3. O introducere in geometrie. Fundatia Theta 2000 (cu Adriana Turtoi). Zbl 1033.51001.

Articole stiintifice

  1. Conformally Einstein Products and Nearly Kaehler Manifolds (impreuna cu Andrei Moroianu). Annals of Global Analysis and Geometry 33(2008), 11-18.
  2. Embeddings of compact Sasakian manifolds (impreuna cu Misha Verbitsky). Mathematical Research Letters, 14 (2007), 703-710.
  3. Einstein-Weyl structures on complex manifolds and conformal version of Monge-Ampere equation (impreuna cu Misha Verbitsky). Bull. Math. Soc. Sci. Math. Roumanie Tome 51(99) No.4, 2008, 339-353.
  4. Sasakian structures on CR-manifolds (impreuna cu Misha Verbitsky). Geometriae Dedicata 125 (2007), 159-173.
  5. Constructions in Sasakian Geometry (impreuna cu Charles P. Boyer, Krzysztof Galicki). Mathematische Zeitschrift 257 (2007), 907-924.
  6. Locally conformal Kaehler manifolds with potential (impreuna cu Misha Verbitsky). Va aparea in Mathematische Annalen.
  7. Vaisman reduction in complex and quaternionic geometry (impreuna cu R.Gini, M.Parton si P.Piccinni). Journal of Geometry and Physics, 56 (2006), 2501-2522.
  8. CR-submanifolds. A class of examples. Revue roumaine de math. pures appl. 51 (2006) 77-85.
  9. Locally conformally Kaehler manifolds. A selection of results. Lecture Notes of Seminario Interdisciplinare di Matematica, 4(2005), 121-152. MR2007c:53101.
  10. Non-zero contact and Sasakian reduction (impreuna cu O.Dragulete), Differential Geometry and its Applications 24 (2006), 260-270. MR2007e:53111.
  11. Harmonicity and minimality of vector fields and distributions on locally conformal Kaehler and hyperkaehler manifolds (impreuna cu L.Vanhecke), Bull. of the Belgian Math. Soc. "Simon Stevin" 12 (2005) 543-555. MR2007d:53106.
  12. An immersion theorem for Vaisman manifolds (impreuna cu M.Verbitsky), Mathematische Annalen 332 (2005), 121-143. MR2006e:53112.
  13. Locally conformal Kaehler reduction (impreuna cu R. Gini and M. Parton). Crelle Journal fuer die Reine und Angewandte Mathematik 581 (2005), 1-21. MR2006c:53077.
  14. Geometric flow on compact locally conformally Kaehler manifolds (impreuna cu Y.Kamishima). Tohoku Math. J. 57 (2) (2005), 201-221. MR2006g:53112.
  15. Eigenvalue estimates for the Dirac operator and harmonic 1-forms of constant length (impreuna cu A.Moroianu). Comptes Rendus Acad. Sci. Paris, 338 (2004), 561-564. MR2005f:58054.
  16. Structure theorem for compact Vaisman manifolds, Mathematical Research Letters, 10 (2003), 799-805 (impreuna cu M. Verbitsky). Also available at math.DG/0305259. MR2004j:53093).
  17. Potential 1-forms for hyper-Kaehler structures with torsion, Classical and Quantum Gravity 20 (2003), 1845-1856 (impreuna cu Y.S Poon si A.Swann). MR2004e:53070.
  18. Cosphere bundle reduction in contact geometry, Journal of symplectic geometry, 1(4) (2002), 695-714. (impreuna cu O.Dragulete si T.S.Ratiu) MR2004m:53141.
  19. Weyl structures in quaternionic geometry. A state of the art. Barletta, Elisabetta (ed.), Selected topics in geometry and mathematical physics. Vol.I. Potenza: Univ. degli Studi della Basilicata, Dipartimento di Matematica, Seminario Interdisciplinare di Matematica, 43-80 (2001). Zbl 1029.53055
  20. Cayley 4-frames and a quaternion Kaehler reduction related to Spin(7), Global differential geometry: the mathematical legacy of Alfred Gray (Bilbao 2000), 401-405, Contemporary Mathematics 288, Amer. Math. Soc. Providence, RI, 2001 (impreuna cu Paolo Piccinni). MR 2003c:53072.
  21. Reduction of Sasakian manifolds, Journal of Mathematical Physics 48 (2001), 3809-3816 (impreuna cu G.Grantcharov) MR 2002e:53060.
  22. Local almost contact metric 3-structures, Publicationes Mathematicae (Debrecen) 57 (2000) 499-508 (impreuna cu Paola Matzeu) MR 2002a:53057.
  23. Complex structures on some Stiefel manifolds, Bull. Math. Soc. Sci. Math. Roumanie (N.S.) 49 (2000) (impreuna cu Paolo Piccinni) MR 2002c:53120.
  24. On some moment maps and induced Hopf bundles in the quaternionic projective space, International Journal of Mathematics 11 (2000), 925-942 (impreuna cu Paolo Piccinni) MR 2002a:53061.
  25. Intersections of Riemannian submanifolds. Variations on a theme by T.J.Frankel, Rendiconti di Matematica (Roma), 19 (1999), 107-121 (impreuna cu T.Bingh si L.Tamassy) MR 2000g:53074.
  26. Locally conformal Kaehler metrics on Hopf surfaces, Annales de l'Institut Fourier, 48 (1998), 1107-1127 (impreuna cu P.Gauduchon) MR 2000g:53088.
  27. Compact hyperhermitian-Weyl and quaternion Hermitian-Weyl manifolds, Annals of Global Analysis and Geometry, 16 (1998), 383-398. (impreuna cu P.Piccinni). MR 99k:53097; Erratum, idem, 18 (2000), 105-106. MR 2000k:53044.
  28. An example of an almost hyperbolic Hermitian manifold, International Journal of Mathematics and Mathematical Sciences, 21 (1998), 613-618 (impreuna cu C.-L.Bejan). MR 98m:53039.
  29. Locally conformal Kaehler structures in quaternionic geometry, Transactions of the American Mathematical Society, 349 (1997), 641-655, (impreuna cu P.Piccinni). MR 97e:53091.
  30. Induced Hopf bundles and Einstein metrics, in New developments in differential geometry, Budapest (1996), 295-306, Kluwer (impreuna cu P.Piccinni). MR 99k:53099.
  31. Weyl structures on quaternionic manifolds, Proceedings of the Meeting on Quaternionic Structures in Mathematics and Physics, Trieste 1994. SISSA, Trieste, (1996), 261-267, (impreuna cu P.Piccinni). MR 99k:53098.
  32. Holomorphic and harmonic maps on locally conformal Kaehler manifolds, Bolletino dell'Unione Matematica Italiana, (7)9-A(1995), 569-579, (impreuna cu S.Ianus, V.Vuletescu), MR 96i:58037.
  33. Conformal geometry of Riemannian submanifolds. Gauss, Codazzi and Ricci equations, Rendiconti di Matematica (Roma), 15, (1995), 233-249, (impreuna cu G.Romani). Zbl. 833:53015.
  34. Extrinsic spheres of a generalized Hopf manifold. Publ. Math. Debrecen 44 (1994), 189-200 (impreuna cu S.Ianus, K.Matsumoto). MR94m:53080.
  35. Locally conformal Kaehler manifolds. A survey, Quaderno n. 12, Dip. di Mat., Univ. di Roma "La Sapienza", (1994).
  36. The fundamental equations of conformal submersions, Beitrage zur Algebra und Geometrie / Contributions to Algebra and Geometry, 34, (1993), 233-243, (impreuna cu G.Romani), MR 95a:53055.
  37. Submanifolds with parallel second fundamental form in a generalized Hopf manifold, Ricerche di Matematica (Napoli), XLII, (1993), 3-9, MR 95d:35066.
  38. Immersions spheriques dans une variete de Hopf generalisee, Comptes Rendus de l' Acad. Sci. Paris, 316, (1993), 63-66, (impreuna cu S.Ianus, K.Matsumoto), MR 93m:53067.
  39. A theorem on nonnegatively curved locally conformal Kaehler manifolds, Rendiconti di Matematica (Roma), serie VII, 12, (1992), 257-262, MR 93h:53071.
  40. A certain symmetric F-connection in locally conformal Kaehler manifolds. Bull. Yamagata Univ. Natur. Sci. 12 (1991), no.4, 299-306 (impreuna cu S.Ianus, K.Matsumoto). MR92a:53026.
  41. A class of antiinvariant submanifolds of a generalized Hopf manifold, Bull. Math. de la Soc. Sci. Math. de Roumanie, 34, (1990), 115-123, (impreuna cu S.Ianus), MR 91m:53039.
  42. Minimal real hypersurfaces of a generalized Hopf manifold, Analele St. Univ. "Al. I. Cuza" Iasi, 2, (1990), 137-142, MR 92i:53019.
  43. Complex hypersurfaces with planar geodesics in generalized Hopf manifolds, Mathematika Balkanica 3 (1989) 92-96, MR 90g:53072.
  44. Complex hypersurfaces of a generalized Hopf manifold, Publications de l'Inst. Math. (Beograd), 42, (1987), 123-129, (impreuna cu S.Ianus, K.Matsumoto) MR 89f:53079.
  45. On certain vector fields in locally conformal Kaehler manifolds, Bull. Yamagata Univ. Natur. Sci. 11 (1987), 335--344 (impreuna cu S.Ianus, K.Matsumoto). MR88b:53077.
  46. CR-submanifolds of a locally conformal Kaehler manifold, Demonstratio Mathematica, 19, (1986), 863-869, MR 90g:53072.
  47. Subvarietati CR-generice in S-varietati, Stud. Cerc. Mat. 36 (1984), 435-443. MR86j:53084.



Actualizat: 29 iulie 2007


ACTIUNI, COACTIUNI SI GRADUARI PE ALGEBRE

 

ACTIUNI, COACTIUNI SI GRADUARI PE ALGEBRE

COD IDEI 1904, contract nr. 479/13.01.2009

Descriere succinta a proiectului de cercetare

Conceptul de graduare isi are originea in teoria polinoamelor si este un instrument important de studiu in teoria reprezentarilor de grupuri, algebra comutativa, geometrie algebrica, comologie, algebre Lie, geometrie diferentiala si fizica teoretica. Cum o G-graduare a unei k-algebre este exact o structura de k[G]-comodul algebra, graduarile sunt cazuri speciale de coactiuni. Proiectul abordeaza, din punct de vedere al graduarii, mai multe directii actuale de cercetare din algebra necomutativa: algebre semisimple, algebre envelopante universale, algebre envelopante cuantice, actiuni si coactiuni pentru algebre de tip Hopf, algebre de (quasi)matrice, algebre de polinoame. Pe scurt, obiectivele stiintifice principale ale proiectului sunt:
1.Studiul graduarilor pe algebre semisimple dupa grupuri.
2.Studiul graduarilor pe algebre de matrice dupa semigrupuri.
3.Studiul graduarilor algebrei de polinoame dupa un grup.
4.Obtinerea de graduari dupa un grup pe algebre universale envelopante si pe algebre envelopante cuantice.
5.Un studiu al coactiunilor unor grupuri cuantice pe anumite clase de algebre.
6.Caracterizarea categoriilor definite de actiuni si coactiuni ale unor (co)algebre graduate de tip Hopf ca si categorii de module graduate dupa un grup, peste o algebra graduata de tip produs smash.
7.Initierea unei teorii de tip Hopf-Galois pentru (co)algebre graduate de tip Hopf.
8.Obtinerea de structuri de quasialgebra graduata pe diverse inele de matrice.

Director de proiect

Prof.dr. Sorin Dascalescu, Facultatea de Matematica si Informatica a Universitatii din Bucuresti.

Seminarii de lucru

 Data  Titlul seminarului
 29.06.2009  Graduari dupa grupuri pe algebre semisimple
 03.09.2009  Actiuni si coactiuni de algebre de tip Hopf si categorii de module graduate induse de acestea
 12.10.2009  Graduari dupa semigrupuri pe algebre de matrice
 14.04.2010  Graduari pe algebra de polinoame
 23.06.2010  Graduari pe diverse algebre Lie
 06.10.2010  Problema generatorilor blanzi
 10.11.2010  Grupul automorfismelor lui g+, pentru g algebra Lie simpla complexa
 04.03.2011  Teorie Hopf-Galois 1
 18.03.2011  Teorie Hopf-Galois 2
 12.04.2011  Coactiuni ale grupurilor cuantice pe anumite clase de algebre 1
 26.04.2011  Coactiuni ale grupurilor cuantice pe anumite clase de algebre 1
 11.05.2011  1 Contexte Morita 1
 25.05.2011  Contexte Morita 2
 07.10.2011  Algebre de incidenta 1
 14.10.2011  Algebre de incidenta 2
 21.10.2011  Coalgebre de incidenta 1
 28.10.2011  Coalgebre de incidenta 2
 04.11.2011  (Co)algebre graduate de tip Cayley-Dickson 1
 11.11.2011  (Co)algebre graduate de tip Cayley-Dickson 2
 18.11.2011  Graduari pe (Co)algebre Clifford 1
 25.11.2011  Graduari pe (Co)algebre Clifford 2

Echipa de cercetare a grantului:

Cercetare sprijinita financiar de acest grant:

1. D. Bulacu, The weak braided Hopf algebra structure of some Cayley-Dickson algebras, J. Algebra 322 (2009), 2404-2427.
2. S. Dascalescu, C. Nastasescu, Coactions on spaces of morphisms, Algebras and Representation Theory 12 (2009), 193-198.
3. D. Bulacu, S. Caenepeel, B. Torrecillas, The braided monoidal structures on a category of vector spaces graded by the Klein group, Proceedings of the Edinburgh Mathematical Society 54(3) (2011), 613-641.
4. F. Castano Iglesias, C. Nastasescu, J. Vercruysse, Quasi-Frobenius functors. Applications, Comm. Algebra 38(2010), 3057-3077.
5. D. Bulacu, A Clifford algebra is a weak Hopf algebra in a suitable symmetric monoidal category, J. Algebra 332(1)(2011), 244-284.
6. S. Dascalescu, C. Nastasescu, A. Tudorache, A note on regular objects in Grothendieck categories, acceptata pentru publicare in Arabian J. Science and Engineering.
7. D. Bulacu, S. Caenepeel, Algebras graded by discrete Doi-Hopf data and the Drinfeld double of a Hopf group coalgebra, acceptata la Algebras and Representation Theory.
8. L. Daus, C. Nastasescu, M. Nastasescu, Von Neumann regularity of smash products associated with G-set gradings, acceptata la J. Algebra.
9. C. Boboc, S. Dascalescu, L. Van Wyk, Isomorphisms between Morita context rings, acceptata la Linear and Multilinear Algebra.
10. F. Castano Iglesias, C. Nastasescu, L. Nastasescu, Locally stable Grothendieck categories. Applications, acceptata la Applied Categorical Structures.
11. C. Buruiana, Abelian finite group gradings on the skew polynomial ring k[X][Y,\phi], acceptata pentru publicare in U.P.B. Sci. Bull., Ser. A.
12. S. Dascalescu, C. Nastasescu, G. Velicu, Balanced bilinear forms and finiteness properties for incidence coalgebras over a field, Rev. Union Mat. Argentina 51 (2010), 13-20.
13. D. Bulacu, S. Caenepeel, A monoidal structure on the category of relative Hopf modules, acceptata pentru publicare in Journal of Algebra and its applications.
14. S. Dascalescu, M. Iovanov, C. Nastasescu, Path subcoalgebras, subcoalgebras of incidence coalgebras, finiteness properties and quantum groups, trimisa spre publicare.
15. C. Buruiana, Group gradings on polynomial algebras, trimisa spre publicare.
16. S. Dascalescu, C. Nastasescu, B. Toader, Doi-Hopf modules associated to comodule coalgebras, trimisa spre publicare la Communications in Algebra.
17. S. Crivei, C. Nastasescu, L. Nastasescu, A generalization of the Mitchell lemma. The Ulmer theorem and the Gabriel-Popescu theorem revisited, trimisa spre publicare la Journal of Pure and Applied Algebra.

Teze de doctorat

1. A. Tudorache, Obiecte relativ regulate in categorii abeliene. Aplicatii la inele graduate si coalgebre, Teza de doctorat, sustinuta in martie 2010.
2. C. Buruiana, Actiuni si coactiuni pe algebre. Graduari, Teza de doctorat, sustinuta in septembrie 2011

Workshop

"Actiuni, coactiuni si graduari pe algebre", organizat pe data de 28.11.2011. Au fost sustinute urmatoarele prelegeri:
  - Module Doi-Hopf asociate comodul coalgebrelor;
  - Structuri braided monoidale pe anumite spatii vectoriale graduate;
  - Subcoalgebre ale coalgebrelor de incidenta;
  - Graduari pe inele de polinoame (strambe).

Raportari

2002 - 2015 -- Facultatea de Matematica si Informatica, Universitatea din Bucuresti
Str. Academiei nr. 14, sector 1, C.P. 010014, Bucuresti, Romania
Tel: (4-021) 314 2863, Fax: (4-021) 315 6990, secretariat fmi.unibuc.ro