All Stories

  1. Abelian groups with C2

    Article • Journal of Algebra and Its Applications, December 2023, World Scientific Pub Co Pte Lt

    Ph D Grigore Calugareanu

  2. Similarity for 2 × 2 Matrices Obtained by Clockwise “Rotation”

    Article • Mathematica Pannonica, December 2023, Akademiai Kiado

    Ph D Grigore Calugareanu

  3. Dependent rings

    Article • Rendiconti del Circolo Matematico di Palermo Series 2, May 2023, Springer Science + Business Media

    Ph D Grigore Calugareanu

  4. Unipotent diagonalization of matrices

    Article • International Electronic Journal of Algebra, April 2023, The International Electronic Journal of Algebra

    Ph D Grigore Calugareanu

  5. On unit stable range matrices

    Article • ANNALI DELL UNIVERSITA DI FERRARA, March 2023, Springer Science + Business Media

    Ph D Grigore Calugareanu

  6. Utumi Abelian groups

    Article • Rendiconti del Seminario Matematico della Università di Padova, February 2023, European Mathematical Publishing House

    Ph D Grigore Calugareanu

  7. Rings Whose Clean Elements are Uniquely Clean

    Article • Mediterranean Journal of Mathematics, December 2022, Springer Science + Business Media

    Ph D Grigore Calugareanu

  8. On idempotent stable range 1 matrices

    Article • Special Matrices, January 2022, De Gruyter

    Ph D Grigore Calugareanu

  9. 3×3 idempotent matrices over some domains and a conjecture on nil-clean matrices

    Article • Annals of the Alexandru Ioan Cuza University - Mathematics, January 2022, Editura Universitatii Alexandru Ioan Cuza din Iasi

    Ph D Grigore Calugareanu

  10. On Zero Determinant Matrices that are Full

    Article • Mathematica Pannonica, October 2021, Akademiai Kiado

    Ph D Grigore Calugareanu

  11. Singular matrices that are products of two idempotents or products of two nilpotents

    Article • Special Matrices, September 2021, De Gruyter

    Ph D Grigore Calugareanu

  12. ABELIAN GROUPS WITH LEFT COMORPHIC ENDOMORPHISM RINGS

    Article • International Electronic Journal of Algebra, July 2021, The International Electronic Journal of Algebra

    Ph D Grigore Calugareanu

  13. Rings with fine nilpotents

    Article • ANNALI DELL UNIVERSITA DI FERRARA, July 2021, Springer Science + Business Media

    Ph D Grigore Calugareanu

  14. On Unit Fine Rings

    Article • Mediterranean Journal of Mathematics, April 2021, Springer Science + Business Media

    Ph D Grigore Calugareanu

  15. Are nil-clean 3 × 3 integral matrices, exchange?

    Article • Annals of the Alexandru Ioan Cuza University - Mathematics, January 2021, Editura Universitatii Alexandru Ioan Cuza din Iasi

    Ph D Grigore Calugareanu

  16. The nil-clean 2 × 2 integral units

    Article • Hacettepe Journal of Mathematics and Statistics, December 2020, Hacettepe Journal of Mathematics and Statistics

    Ph D Grigore Calugareanu

  17. Jacobsons Lemma fails for nil-clean 2 × 2 integral matrices

    Article • Analele Universitatii Ovidius Constanta - Seria Matematica, December 2020, De Gruyter

    Ph D Grigore Calugareanu

  18. Rings with fine idempotents

    Article • Journal of Algebra and Its Applications, October 2020, World Scientific Pub Co Pte Lt

    Ph D Grigore Calugareanu

  19. Solitary subgroups of Abelian groups

    Article • Expositiones Mathematicae, October 2020, Elsevier

    Ph D Grigore Calugareanu

  20. Trace 1, 2×2 matrices over principal ideal domains are exchange

    Article • Carpathian Journal of Mathematics, September 2020, Technical University of Cluj Napoca, North University Center of Baia Mare

    Ph D Grigore Calugareanu

  21. Matrices that are similar to their inverses

    Article • The Mathematical Gazette, March 2020, Cambridge University Press

    Ph D Grigore Calugareanu

  22. Strictly Invariant Submodules

    Article • Mediterranean Journal of Mathematics, July 2019, Springer Science + Business Media

    Ph D Grigore Calugareanu

  23. Idempotent matrices with invertible transpose

    Article • Georgian Mathematical Journal, June 2019, De Gruyter

    Ph D Grigore Calugareanu

  24. A new class of nil-clean elements which are exchange

    Article • Beiträge zur Algebra und Geometrie / Contributions to Algebra and Geometry, February 2019, Springer Science + Business Media

    Ph D Grigore Calugareanu

  25. Abelian groups with left morphic endomorphism ring

    Article • Journal of Algebra and Its Applications, August 2018, World Scientific Pub Co Pte Lt

    Ph D Grigore Calugareanu

  26. Subgroups generated by images of endomorphisms of Abelian groups and duality

    Article • Journal of Group Theory, June 2018, De Gruyter

    Ph D Grigore Calugareanu, Andrey Chekhlov

  27. Tripotents: a class of strongly clean elements in rings

    Article • Analele Universitatii Ovidius Constanta - Seria Matematica, March 2018, De Gruyter

    Ph D Grigore Calugareanu

  28. Clean integral 2 × 2 matrices

    Article • Studia Scientiarum Mathematicarum Hungarica, March 2018, Akademiai Kiado

    Ph D Grigore Calugareanu

  29. Strongly inert subgroups of abelian groups

    Article • Rendiconti del Seminario Matematico della Università di Padova, December 2017, European Mathematical Publishing House

    Ph D Grigore Calugareanu

  30. Uniquely clean 2×2 invertible integral matrices

    Article • Studia Universitatis Babes-Bolyai Matematica, September 2017, Babes-Bolyai University

    Ph D Grigore Calugareanu

  31. UN-rings

    Article • Journal of Algebra and Its Applications, November 2016, World Scientific Pub Co Pte Lt

    Ph D Grigore Calugareanu

  32. Some matrix completions over integral domains

    Article • Linear Algebra and its Applications, October 2016, Elsevier

    Ph D Grigore Calugareanu

  33. Fine rings: A new class of simple rings

    Article • Journal of Algebra and Its Applications, August 2016, World Scientific Pub Co Pte Lt

    Ph D Grigore Calugareanu

  34. Sums of nilpotent matrices

    Article • Linear and Multilinear Algebra, March 2016, Taylor & Francis

    Ph D Grigore Calugareanu

  35. Pseudo injective abelian groups

    Article • Forum Mathematicum, January 2015, De Gruyter

    Ph D Grigore Calugareanu, Phill Schultz

  36. STRONGLY INVARIANT SUBGROUPS

    Article • Glasgow Mathematical Journal, December 2014, Cambridge University Press

    Ph D Grigore Calugareanu

  37. A nil-clean 2 × 2 matrix over the integers which is not clean

    Article • Journal of Algebra and Its Applications, April 2014, World Scientific Pub Co Pte Lt

    Ph D Grigore Calugareanu

  38. Nil-clean matrix rings

    Article • Linear Algebra and its Applications, November 2013, Elsevier

    Ph D Grigore Calugareanu

  39. Between Morphic and Hopfian

    Article • Analele Universitatii Ovidius Constanta - Seria Matematica, January 2013, De Gruyter

    Ph D Grigore Calugareanu

  40. Type 1 representable lattices of dimension at most 4

    Article • Algebra Universalis, February 2012, Springer Science + Business Media

    Ph D Grigore Calugareanu

  41. On Abelian Groups with commutative clean endomorphism rings

    Article • Annals of the Alexandru Ioan Cuza University - Mathematics, January 2012, De Gruyter

    Ph D Grigore Calugareanu

  42. Realization Theorems for Triangular Rings

    Article • Annals of the Alexandru Ioan Cuza University - Mathematics, January 2011, De Gruyter

    Ph D Grigore Calugareanu

  43. MODULES WITH ABELIAN ENDOMORPHISM RINGS

    Article • Bulletin of the Australian Mathematical Society, June 2010, Cambridge University Press

    Ph D Grigore Calugareanu

  44. MORPHIC ABELIAN GROUPS

    Article • Journal of Algebra and Its Applications, April 2010, World Scientific Pub Co Pte Lt

    Ph D Grigore Calugareanu

  45. Rings with Lattices of Idempotents

    Article • Communications in Algebra, March 2010, Taylor & Francis

    Ph D Grigore Calugareanu

  46. SPLIT-EXTENSIONS OF EXCHANGE RINGS: A DIRECT PROOF

    Article • Journal of Algebra and Its Applications, October 2009, World Scientific Pub Co Pte Lt

    Ph D Grigore Calugareanu

  47. Every Abelian group is determined by a subgroup lattice

    Article • Studia Scientiarum Mathematicarum Hungarica, March 2008, Akademiai Kiado

    Ph D Grigore Calugareanu

  48. A solution to a problem on lattice isomorphic Abelian groups

    Article • January 2008, De Gruyter

    Ph D Grigore Calugareanu

  49. Endomorphisms and automorphisms of squares of abelian groups

    Article • January 2008, De Gruyter

    Ph D Grigore Calugareanu

  50. Abelian groups determined by subgroup lattices of direct powers

    Article • Archiv der Mathematik, February 2006, Springer Science + Business Media

    Ph D Grigore Calugareanu

  51. Abelian groups whose subgroup lattice is the union of two intervals

    Article • Journal of the Australian Mathematical Society, February 2005, Cambridge University Press

    Ph D Grigore Calugareanu

  52. ABELIAN GROUPS WITH SEMI-LOCAL ENDOMORPHISM RING

    Article • Communications in Algebra, January 2002, Taylor & Francis

    Ph D Grigore Calugareanu