**Institute annual report 2023**

Main version: December 4, 2023.

updates: February 21, 2024 (paper of Otrocol added); December 30, 2023; December 19, 2023 (paper coordinates of Precup and of Agratini)

Main version: December 4, 2023.

updates: February 21, 2024 (paper of Otrocol added); December 30, 2023; December 19, 2023 (paper coordinates of Precup and of Agratini)

The Numerical Analysis and Approximation Theory workgroup:

- Dr. Emil
**Cătinaş**(workgroup coordinator) - Prof. Dr. Octavian
**Agratini** - Dr. Mihai
**Nechita** - Dr. Diana
**Otrocol** - Imre
**Boros** - Andra
**Malina** - Eduard
**Grigoriciuc**

The Numerical Modeling workgroup:

- Prof. Dr. Radu
**Precup**, corresponding member of the Romanian Academy - Dr. Călin-Ioan
**Gheorghiu**(workgroup coordinator) - Dr. rer. nat. habil. Nicolae
**Suciu** - Dr. Maria
**Crăciun** - Andrei
**Stan** - Iulia
**Buda**

Doctoral students in 2023:

- Iulia
**Buda**, at UBB Cluj - Eduard
**Grigoriciuc***,*at UBB Cluj - Andra
**Malina**,*Metode de aproximare a functiilor de mai multe variabile,*at UBB Cluj - Andrei
**Stan**,*Nash type equilibria for systems of nonlinear equations,*at UBB Cluj.

Postdoc students in 2023:

- Mihai
**Nechita**, at UBB Cluj (till September 2023)

**Prof. dr.**** Radu Precup****, **corresponding member of the Romanian Academy

*PhD students (2023): *

- Andrei
**Stan**,*Nash type equilibria for systems of nonlinear equations*, at UBB Cluj - Alexandru Hofman,
*Control problems for systems of Kolmogorov type*, at UBB Cluj - Alexandru Orzan,
*Parametric methods for problems of fractional optimization*, at UBB Cluj - David Brumar,
*The analysis of some mathematical models in fluid dynamics*, at UBB Cluj.

*Coordination of doc and postdoc students: *Nataliia Kolun (Ukraine).

*Mentor in some research projects:* Lorand Parajdi, Mihai Nechita, Maria Neuss-Radu.

**Prof. Univ. dr. Octavian Agratini
**

- Grapini O. Silviu-Ilie, at UBB Cluj (thesis not finalized yet)
- Balogh M. Anamaria, at UBB Cluj (thesis not finalized yet)
- Bunea-Domșa S. Mihai Grigore, at UBB Cluj (thesis not finalized yet).

**Dr. rer. nat. habil. Nicolae Suciu
**(no PhD students in 2023)

**Prof. Univ. dr. Ion Păvăloiu **(honorary member of ICTP till August 2023)

(no PhD students in 2023)

- N. Suciu, F.A. Radu, I.S. Pop,
*Space-time upscaling of reactive transport in porous media*, Advances in Water Resources, 176 (2023), art. no. 104443, https://doi.org/10.1016/j.advwatres.2023.104443 (**IF****4.7**, Cite score 9.1) - C.I. Gheorghiu,
*Accurate Laguerre collocation solutions to a class of Emden–Fowler type BVP,*, (IF 2.1) - R. Precup, A. Stan,
*Linking methods for componentwise variational systems*, Results Math.**78**(2023) art. no. 246, https://doi.org/10.1007/s00025-023-02026-x - L.G. Parajdi, F. Pătrulescu, R. Precup, I. Şt. Haplea,
*Two numerical methods for solving a nonlinear system of integral equations of mixed Voltera-Fredholm type arising from a control problem related to leukemia,*Journal of Applied Analysis & Computation,**13**(2023) no. 4, pp. 1797-1812, http://doi.org/10.11948/20220197 - L.G. Parajdi, R. Precup, I.-S. Haplea,
*A method of lower and upper solutions for control problems and application to a model of bone Marrow transplantation*, Int. J. Appl. Math. Comput. Sci.,**33**(2023) no. 3, 409–418, http://doi.org/10.34768/amcs-2023-0029 - A. Orzan, R. Precup,
*Dinkelbach type approximation algorithms for nonlinear fractional optimization problems,*Numerical Functional Analysis and Optimization,**44**(2023) no. 9, pp. 954–969. https://doi.org/10.1080/01630563.2023.2217893 - M. Kohr, R. Precup,
*Analysis of Navier-Stokes models for flows in bidisperse porous media*, J. Math. Fluid Mechanics, 25 (2023) art. no. 38, https://doi.org/10.1007/s00021-023-00784-w - R. Precup, J. Rodríguez-López,
*Positive radial solutions for Dirichlet problems via a Harnack-type inequality,*Mathematical Methods in the Applied Sciences,**46**(2023) no. 2, pp. 2972-2985, https://doi.org/10.1002/mma.8682 - R. Precup, J. Rodríguez-López,
*Componentwise localization of solutions to systems of operator inclusions via Harnack type inequalities,*Quaestiones Mathematicae,**46**(2023) no. 7, pp. 1481-1496, https://doi.org/10.2989/16073606.2022.2107959 - N. Kolun, R. Precup,
*Energy-based localization of positive solutions for stationary Kirchhoff-type equations and systems*, Georgian Math. J.,**30**(2023) no. 6, pp. 891-902, https://doi.org/10.1515/gmj-2023-2039 - U. Abel, O. Agratini, M. Ivan,
*Asymptotic properties of Kantorovich-type Szász–Mirakjan operators of higher order*, Mathematical Foundations of Computing, 2023, https://doi.org/10.3934/mfc.2023003 (ESCI) - A. Novac, D. Otrocol, D. Popa,
*On Ulam stability of a partial differential operator in Banach spaces*, Mathematics, 11 (2023) no. 11, art. no. 2488, https://doi.org/10.3390/math11112488 - A. Malina, Iterative Shepard operator of least squares thin-plate spline type, Dolomites Res. Notes Approx., 16(2023), No. 3, pp. 57-62. http://doi.org/10.14658/PUPJ-DRNA-2023-3-8 (ESCI)
- A. Stan,
*Nash equilibria for componentwise variational systems*, Journal of Nonlinear Functional Analysis, 2023 (2023), art. no. 6, http://jnfa.mathres.org/archives/3029 (ESCI) - E.S. Grigoriciuc,
*New subclasses of univalent mappings in several complex variables: extension operators and applications*, Comput. Methods Funct. Theory, 23 (3) (2023), 533-555.

- R. Precup,
*On the iterates of uni- and multidimensional operators*, Bulletin of the Transilvania University of Brasov Series III: Mathematics and Computer Science,**3**(**65**) (2023) no. 2, pp. 143-152, https://doi.org/10.31926/but.mif.2023.3.65.2.12 - M. Nechita,
*Solving ill-posed Helmholtz problems with physics-informed neural networks*, J. Numer. Anal. Approx. Theory**52**(2023), no. 1, pp. 90-101, https://doi.org/10.33993/jnaat521-1305 - U. Abel, O. Agratini,
*P**ăltănea’s operators: old and new results,*Bulletin of the Transilvania University of Brașov, Serie III: Mathematics and Computer Science,**3**(**65**) (2023) no. 2, pp. 1.12, https://doi.org/10.31926/but.mif.2023.3.65.2.1 - A. Stan,
*Localization of Nash-type equilibria for systems with partial variational structure*, J. Numer. Anal. Approx. Theory,**52**(2023) no. 2, pp. 253-272, https://doi.org/10.33993/jnaat522-1356. - T. Cătinaş, I. Buda,
*An extension of the Cheney-Sharma operator of the first kind*, J. Numer. Anal. Approx. Theory,**52**(2023) no. 2, pp. 172-181, https://doi.org/10.33993/jnaat522-1373.

- E. Cătinaş,
*The strict superlinear order can be faster than the infinite order*, Numer. Algor., (2023). https://doi.org/10.1007/s11075-023-01604-y - S. Koumla, R. Precup, N. Ngarasta,
*Existence results for some functional integrodifferential equations with state-dependent delay,*Differ. Eq. Dyn. Syst., (2023). https://doi.org/10.1007/s12591-023-00661-y - C. Günther, Al. Orzan and R. Precup,
*Componentwise Dinkelbach algorithm for nonlinear fractional optimization problems*, Optimization, published online 2023, https://doi.org/10.1080/02331934.2023.2256750 - N. Kolun, R. Precup,
*Localization of solutions for semilinear problems with poly-Laplace type operators,*Applicable Analysis, published online 2023, https://doi.org/10.1080/00036811.2023.2218869

- E. Burman, M. Nechita, L. Oksanen,
*Optimal finite element approximation of unique continuation*, arXiv 2311.07440 (2023), https://arxiv.org/abs/2311.07440 - M. Crăciun, T. Harko,
*Testing Weyl geometric gravity with the SPARC galactic rotation curves database***,**submitted to Physics of Dark Universe, https://doi.org/10.48550/arXiv.2311.16893 - A. Pop, M. Crăciun,
*Detection and Detectability. The Case of TOI-763,*submitted to New Astronomy - A. Pop, M. Crăciun,
*Detection and Detectability: Evidence for a Low Amplitude Orbital Period Modulation in the Algol-type Binary U Coronae Borealis* - A. Stan,
*Role of partial functionals in the study of variational systems*, https://arxiv.org/abs/2311.15552

- E. Cătinaș, has won the 2023 “Gr. Moisil” prize of the Romanian Academy for the paper E. Cătinaş,
*How many steps still left to x*?*, SIAM Rev. 63 (2021) no. 3, pp. 585–624. - Prof. Dr. R. Precup has
**H-index ISI 16**: https://www.webofscience.com/wos/author/rid/B-8158-2011 (h-index Google Scholar 23) - Dr. rer. nat. habil. N. Suciu has
**H-index ISI 13**: https://www.webofscience.com/wos/author/rid/N-7971-2017 (h-index Google Scholar 14) - Prof. Dr. O. Agratini has
**H-index ISI 10**: https://www.webofscience.com/wos/author/rid/B-6607-2012 (h-index Google Scholar 20)

Since 2022, O. Agratini is professor emeritus at the Faculty of Mathematics and Computer Science (Babeş-Bolyai University).

- R. Precup, Editor-in-Chief of Studia UBB Math. (ISI/ESCI)
- R. Precup, Deputy Editor-in-Chief of Fixed Point Theory (Cluj) (ISI)
- O. Agratini, Editor-in-Chief of J. Numer. Anal. Approx. Theory (Scopus)
- E. Cătinaş, Editor-in-Chief of J. Numer. Anal. Approx. Theory (Scopus)
- I. Păvăloiu, deputy Editor-in-Chief of J. Numer. Anal. Approx. Theory (till August 2023) (Scopus)
- O. Agratini, senior Editor of Studia UBB Math. (ISI/ESCI)

– JCR/ISI journals abroad

- R. Precup, section Editor of Fixed Point Theory and Algorithms for Sciences and Engineering (Springer);
- R. Precup, editor of Journal of Inequalities and Special Functions.

– JCR/ISI journals from Romania

- R. Precup, member of the Editorial Board of Proceedings of the Romanian Academy- Series A
- R. Precup, member of the Editorial Board of Carpathian Journal of Mathematics
- R. Precup, Deputy Editor-in-Chief of Fixed Point Theory (Cluj)
- R. Precup, Editor-in-Chief of Studia UBB Math.
- O. Agratini, senior Editor of Studia UBB Math.
- O. Agratini, member of the Editorial Board of J. Science and Arts;

- O. Agratini, Editor-in-Chief of J. Numer. Anal. Approx. Theory
- E. Cătinaş, Editor-in-Chief of J. Numer. Anal. Approx. Theory
- I. Păvăloiu, deputy Editor-in-Chief of J. Numer. Anal. Approx. Theory (till August 2023)
- M. Nechita, secretary of J. Numer. Anal. Approx. Theory
- A. Malina, secretary of J. Numer. Anal. Approx. Theory
- A. Stan, secretary of J. Numer. Anal. Approx. Theory
- R. Precup, member of the Editorial Board of Mathematica (Cluj)
- O. Agratini, member of the Editorial Board of Mathematica (Cluj)

- R. Precup, member of the Editorial Board of Discussiones Mathematicae Differential Inclusions, Control and Optimization (Poland);
- O. Agratini, member of the Editorial Board of Open Journal of Discrete Mathematics;
- R. Precup, member of the Editorial Board of Mathematics in Engineering, Science and Aerospace (USA).

- R. Precup, member of the Editorial Board of Transylvanian Journal of Mathematics and Mechanics;
- N. Suciu, member of the Editorial Board of ROMAI Journal
- C.I. Gheorghiu, member of the Editorial Board of ROMAI Journal

- The international conference Numerical Analysis, Numerical Modeling, Approximation Theory (NA-NM-AT 2022), November 6-9, 2023 (organized by ICTP)
- Fifth Romanian Itinerant Seminar on Mathematical Analysis and its Applications, Craiova, May 26-28, 2023 (co-organized by ICTP)
- NANMAT Workshop for Young PhD students, November 25-26, 2023, Belis, Cluj (organized by ICTP).

- R. Precup,
*Fifth Romanian Itinerant Seminar on Mathematical Analysis and Its Applications*, Craiova 26–28 May 2023. http://rismaa.ucv.ro/ - O. Agratini,
*17th International Conference on Applied Mathematics and Computer Science*, Cluj-Napoca, July 11-13, 2023, http://tucn.ro/angheluta2023/

- R. Precup,
*The Tenth Congress of Romanian Mathematicians,*June 30-July 5, 2023, Piteşti, Romania. (member in the organizing committee of Section 4) http://www.imar.ro/~congmatro10/index.html - R. Precup,
*Fifth Romanian Itinerant Seminar on Mathematical Analysis and Its Applications*, Craiova 26–28 May 2023 (coordinator) http://rismaa.ucv.ro/ - R. Precup,
*Mathematical Modelling Analysis and Simulation with Applications to Biomedical Processes (Workshop)*, Cluj-Napoca, October 9-10, 2023 (coorganizer) - E. Grigoriciuc, Workshop: Geometric Function Theory in Several Complex Variables and Complex Banach Spaces, Cluj- Napoca, December 1-2, 2023. https://math.ubbcluj.ro/workshop_gk/

- N. Suciu,
*Random walk methods for reactive transport in porous media*, invited talk at Karlstad Applied Analysis Seminar (KAAS), Karlstadt University, Sweden, February 8, 2023. Karlstad Applied Analysis Seminar (KAAS) | Karlstads universitet (kau.se) - R. Precup,
*Explicit and implicit control problems. A fixed point approach,*International Meetings on Differential Equations and Their Applications, University of Technology, Lodz, Poland, 8 martie 2023, https://im.p.lodz.pl/IMDETA/index.php/schedule/summer-semester-2023 - R. Precup,
*Energy-localization in Navier-Stokes models with reaction terms,*The Tenth Congress of Romanian Mathematicians, Piteşti, June 30 – July 5. http://www.imar.ro/~congmatro10/index.html - R. Precup,
*Energy-localization in Navier-Stokes models,*Workshop: Geometric Function Theory in Several Complex Variables and Complex Banach Spaces, Cluj- Napoca, December 1-2, 2023. https://math.ubbcluj.ro/workshop_gk/ - M. Nechita,
*Unique continuation for the Helmholtz equation using conforming FEM and physics-informed neural networks*, Workshop: Simulation of data assimilation under a PDE constraint, Sorbonne Université, Paris, November 16-17, 2023, https://www.ljll.math.upmc.fr/delay/workshop_data_assimilation

- O. Agratini,
*On a generalization of the Gauss-Weierstrass operators*, Numerical Analysis, Numerical Modeling and Approximation Theory (NANMAT 2023), November 6-9, 2023, Cluj-Napoca (virtual). - I. Boros,
*Can AI aid in solving stiff ODEs? Harnessing physics-informed neural networks for stiff ordinary differential equations*, Numerical Analysis, Numerical Modeling and Approximation Theory (NANMAT 2023), November 6-9, 2023, Cluj-Napoca (virtual). - E. Cătinaş,
*The speed of the strict superlinear convergence*, Numerical Analysis, Numerical Modeling and Approximation Theory (NANMAT 2023), November 6-9, 2023, Cluj-Napoca (virtual). - M. Crăciun,
*On some methods of fitting models to observational data*, Numerical Analysis, Numerical Modeling and Approximation Theory (NANMAT 2023), November 6-9, 2023, Cluj-Napoca (virtual). - M. Crăciun, T. Harko,
*Observational constraints on Weyl geometric gravity from the SPARC galactic rotation curves database,*7th International Conference in Astronomy, Astrophysics, Space and Planetary Sciences, 10-12 July 2023, Cluj Napoca, https://acad-cj.ro/acte/manifestari/ConferenceAbstractBook2023_RevVT.pdf - A. Pop, M. Crăciun,
*Orbital period variability of U CrB – a new approach*, 7th International Conference in Astronomy, Astrophysics, Space and Planetary Sciences, 10-12 July 2023, Cluj Napoca, https://acad-cj.ro/acte/manifestari/ConferenceAbstractBook2023_RevVT.pdf - C.-I. Gheorghiu,
*Spectral collocation methods for some pseudo-parabolic problems. Numerical experiments*, Numerical Analysis, Numerical Modeling and Approximation Theory (NANMAT 2023), November 6-9, 2023, Cluj-Napoca (virtual). - E. Grigoriciuc,
*Subclasses of univalent mappings in*\(\mathbb{C}^n\)*and the Graham-Kohr extension operator*, 9th International Conference on Mathematics and Informatics, Sapientia Hungarian University of Transylvania (Department of Mathematics and Informatics), Târgu Mureş, Romania, 7-8 September 2023; - E. Grigoriciuc,
*g-Loewner chains and the Graham-Kohr extension operator in complex Banach spaces*, Geometric Function Theory in Several Complex Variables and Complex Banach Spaces, 3rd Edition of The Workshop dedicated to the memory of Professor Gabriela Kohr, Faculty of Mathematics and Computer Science, “Babeş-Bolyai” University, Cluj-Napoca (Romania), 1-3 December 2023; - A. Malina,
*Combined Shepard operators applied in image reconstruction*, Numerical Analysis, Numerical Modeling and Approximation Theory (NANMAT 2023), November 6-9, 2023, Cluj-Napoca (virtual). - A. Malina,
*An application of the Shepard operator in image reconstruction*, 9th International Conference on Mathematics and Informatics (MathInfo), September 7-8, 2023, Târgu Mureș, Romania. - M. Nechita,
*Data assimilation for fluid-structure interaction. Applications to 4d-flow MRI*, The Tenth Congress of Romanian Mathematicians, June 30 – July 5, 2023, Pitești, http://www.imar.ro/~congmatro10/ - M. Nechita,
*Unique continuation for the Helmholtz equation using conforming FEM and physics-informed neural networks*, Numerical Analysis, Numerical Modeling and Approximation Theory (NANMAT 2023), November 6-9, 2023, Cluj-Napoca (virtual). - M. Nechita,
*Ill-posed data assimilation problems: analysis and numerics*, Workshop “Mathematical Modelling, Analysis and Simulation with Applications to Biomedical Processes” – STAR-UBB (ubbcluj.ro), Cluj-Napoca, October 9-10, 2023. - D. Otrocol,
*Ulam stability of a partial differential operator in Banach spaces*, Numerical Analysis, Numerical Modeling and Approximation Theory (NANMAT 2023), November 6-9, 2023, Cluj-Napoca (virtual). - D. Otrocol,
*On Ulam stability of a partial differential operator in Banach spaces*, 59th International Symposium on Functional Equations, Hajdúszoboszló, Hungary, June 18-25, 2023. - D. Otrocol,
*Ulam stability of a partial differential operator in Banach spaces*, 17th International Conference on Applied Mathematics and Computer Science, July 11-13, 2023, Cluj-Napoca, Romania, http://tucn.ro/angheluta2023/ - R. Precup,
*Energy-localization in Navier-Stokes models*, Numerical Analysis, Numerical Modeling and Approximation Theory (NANMAT 2023), November 6-9, 2023, Cluj-Napoca (virtual). - R. Precup,
*Control of cell evolution after bone marrow transplantation,*Workshop “Mathematical Modelling, Analysis and Simulation with Applications to Biomedical Processes” – STAR-UBB (ubbcluj.ro), Cluj-Napoca, October 9-10, 2023. - A. Stan,
*Localization of Nash equilibria for systems with partial variational structure*, Numerical Analysis, Numerical Modeling and Approximation Theory (NANMAT 2023), November 6-9, 2023, Cluj-Napoca (virtual). - N. Suciu,
*Random walk methods for reactive transport in porous media,*The Tenth Congress of Romanian Mathematicians, June 30 – July 5, 2023, http://www.imar.ro/~congmatro10/ Piteşti, Romania - N. Suciu,
*Space–time upscaling of reactive transport in porous media*, Numerical Analysis, Numerical Modeling and Approximation Theory (NANMAT 2023), November 6-9, 2023, Cluj-Napoca (virtual). - N. Suciu, F.A. Radu, J.S. Stokke, E. Cătinaş, A. Malina,
*Computational orders of convergence for Richards’ equation*, ENUMATH 2023, September 4-8, Lisbon, MS39 | Numerical methods for nonlinear and coupled processes (flow, reactive transport and deformation) in porous media. https://enumath2023.com/

- O. Agratini,
*The misterious wavelet world*, NANMAT Workshop for Young PhD Students, November 25-26, Beliş, Cluj. - M. Crăciun,
*Introduction to time series analysis*, NANMAT Workshop for Young PhD Students, November 25-26, Beliş, Cluj. - C. -I. Gheorghiu,
*Spectral Collocation Solutions to some Linear Pseudo-parabolic Problems*, ROMAI Annual Conference, Univ. Al. I. Cuza, Iaşi, Septembrie, 2023, CAIM 23 (romai.ro) - R. Precup,
*Localization of solutions for semilinear problems with poly-Laplace type operators,*Fifth Romanian Itinerant Seminar on Mathematical Analysis and its Applications, Craiova, May 26-28, http://rismaa.ucv.ro/ - N. Suciu,
*Stochastic simulations for diffusion processes*, NANMAT Workshop for Young PhD Students, November 25-26, Beliş, Cluj.

- M. Nechita,
*Ill-posed problems for linear PDEs: analysis and numerics*, Seminar de Analiză și Optimizare, Univ. Babes-Bolyai, 04.2023. - R. Precup,
*Existence results for some functional integrodifferential equations with state-dependent delay,*Seminar on Nonlinear Operators and Differential Equations, Cluj-Napoca, 9 martie 2023. http://www.math.ubbcluj.ro/~nodeacj/soned.html - R. Precup,
*Localization of the enstrophy and kinetic energy in Navier-Stokes models with reaction terms,*Seminar on Nonlinear Operators and Differential Equations, Cluj-Napoca 4 mai 2023. - R. Precup,
*Positive radial solutions for Dirichlet problems in the ball,*Seminar on Nonlinear Operators and Differential Equations, Cluj-Napoca 19 octombrie 2023 - R. Precup,
*Matematica in sprijinul stiintelor aplicate. Cazul specific al medicinei*. Seminarul Studium Generale, Cluj-Napoca, 23 noiembrie 2023. https://www.youtube.com/watch?v=yfJ9L3fzCEc

ICTP has signed in July 2023 a collaboration protocol with Data and Predictive Analytics Center (DPAC – Rochester University, USA), based on some existing collaborations. The agreement aims in solving some problems in the analysis, processing and modelling of some time series from astronomy.

- N. Suciu, collaboration with F.A. Radu, from Univ. of Bergen, Norway
- N. Suciu, collaboration with I.S. Pop, Univ. of Hasselt, Belgium
- E. Cătinaş, collaboration with F.A. Radu, from Univ. of Bergen, Norway
- R. Precup, collaboration with Jorge Rodriguez-Lopez, from Univ. of Santiago de Compostela, Spain
- R. Precup, collaboration with Sylvain Koumla (Univ. Abéché, Chad);
- R. Precup, collaboration with Christian Guenther (Univ. Hannover, Germany);
- R. Precup, collaboration with Maria Neuss-Radu (Erlangen, Germany);
- R. Precup, collaboration with Renata Bunoiu (Univ. Lorraine, France)
- M. Nechita, collaboration with Erik Burman, University College London, https://iris.ucl.ac.uk/iris/browse/profile?upi=ENBUR31
- M. Nechita, collaboration with Lauri Oksanen, University of Helsinki, https://www.helsinki.fi/en/about-us/people/people-finder/lauri-oksanen-9110566
- M. Nechita, collaboration with Miguel A. Fernández, INRIA Paris, https://team.inria.fr/commedia/fernandez/
- O. Agratini, collaboration with Ulrich Abel, Technische Hochschule Mittelhessen, Friedberg, Germany
- O. Agratini, collaboration with Harun Karsli, Abant Izzet Baysal University, Bolu, Turkey
- M. Craciun, collaboration with Mihai Barbosu, Rochester Institute of Technology, New York, USA,

National scientific collaborations

- O. Agratini, collaboration with Ivan Mircea, Technical University Cluj-Napoca
- O. Agratini, collaboration with Radu Păltănea, Transilvania University of Brașov
- M. Craciun, collaboration with Tiberiu Harko, from Univ. Babes-Bolyai (Tiberiu Harko – Google Academic)
- M. Craciun, collaboration with Alexandru Pop, Astronomical Institute, Astronomical Observatory Cluj-Napoca, Romanian Academy, (Alexandru Viorel Pop – Google Academic)
- A. Malina, collaboration with Teodora Catinas, from the Babes-Bolyai University, Cluj-Napoca
- E. Grigoriciuc, collaboration with Mirela Kohr, from the Babes-Bolyai University, Cluj-Napoca
- R. Precup, collaboration with Petru Jebelean (Univ. de Vest, Timisoara);
- R. Precup, collaboration with Mirela Kohr (UBB Cluj-Napoca);
- R. Precup, collaboration with Nataliia Kolun (UBB Cluj-Napoca);
- R. Precup, collaboration with Lorand Parajdi,
- R. Precup, collaboration with Veronica Ilea (UBB Cluj-Napoca);
- R. Precup, collaboration with Adela Novac (Univ. Tehnica, Cluj-Napoca);
- R. Precup, collaboration with Stefan Haplea (UMF Cluj-Napoca);

- N. Suciu member: GAMM (Gesellschaft für angewandte Mathematik und Mechanik) (2019 şi 2020), EGU (European Geosciences Union) (2019-2021), InterPore (International Society for Porous Media) (2021-2023).
- R. Precup, O. Agratini, D. Otrocol: SSMR (Societatea de Științe Matematice din România) members.
- E. Cătinaş, SIAM (Society for Industrial and Applied Mathematics) member (since 2007?), SSMR (Societatea de Științe Matematice din România),
- Grigoriciuc: AMS (American Mathematical Society) member (since 2021), LMS (London Mathematical Society) member (since 2021), EMS (European Mathematical Society) member (since 2021), CMS (Canadian Mathematical Society) member (2021-2022)
- C.I. Gheorghiu, vicepresident ROMAI (Societatea Română de Matematică Aplicată și Industrială) 2018-2021, membru GAMM (Gesellschaft für angewandte Mathematik und Mechanik), ECMI (European Consortium for Mathematics in Industry)
- O. Agratini: AMS (American Mathematical Society) member.

- Subventionarea literaturii tehnico-stiintifice 2023 (37245 lei), director: E. Cătinaş

- Prof. dr. O. Agratini was (up to July 30, 2023) a permanent expert member of ARACIS, in committee C1 (exact sciences and natural sciences/Stiinte exacte si stiinte ale naturii), see https://www.aracis.ro/comisii-de-experti-permanenti/

- R. Precup, for thesis with title:
*Monotonicity and variational methods in Banach spaces with applications in differential equations driven by nonlinear operators*, 2023, by Michal Beldzinski**,**Lodz University of Technology, Poland, March 8, 2023 - O. Agratini, for thesis with title:
*Sublinear and monotone operators in approximation*, by Iancu Ionuț Tudor, Oradea University, April 28, 2023. - R. Precup, for habilitation with title:
*Elliptic Problems Driven by Generalized Laplace Operators*, 2023**,**by - O. Agratini, for habilitation with title:
*Numerical methods in mathematical inequalities*, by Bercu Gabriel Dumitru, Polytechnic University of Bucharest, July 18, 2023.

- R. Precup for: Cristina Gheorghe (supervisor: A. Petrusel);
- R. Precup for: Florin Albisoru (supervisor: M. Kohr)
- R. Precup for: I. Papuc (supervisor: M. Kohr)
- R. Precup for: M. Aron (supervisor: M. Kohr)
- R. Precup for: A. Gasparovici (supervisor: M. Kohr),
- R. Precup for: Andra Malina,
*Metode de aproximare a functiilor de mai multe variabile*(supervisor: T. Catinas) - R. Precup for: Iulia Buda (supervisor: T. Cătinaș)
- O. Agratini for: Alin Fodor (supervisor C. Pintea);
- O. Agratini for: Andra Malina,
*Metode de aproximare a functiilor de mai multe variabile*(supervisor: T. Cătinaș) - O. Agratini for: Iulia Buda (supervisor: T. Cătinaș)
- O. Agratini, for Șuțu Mădălina (supervisor T. Cătinaș)

- O. Agratini: Dolomites Research Note on Approximation (1), Applicable Analysis and Discrete Mathematics (1), Khayyam Journal of Mathematics (1), Studia UBB Math. (3), J. Numer. Anal. Approx. Theory (5);
- E. Cătinaș: J. Numer. Anal. Approx. Theory (11), Studia Univ. Babes-Bolyai Math. (1), ICEMES2023 (1);
- I. Boros: J. Numer. Anal. Approx. Theory (2);
- C.I. Gheorghiu: Mathematics (1), Physica scripta (2), European Physical Journal Plus (2);
- M. Nechita: IMA J. Numer. Anal. (1), ESAIM: Math. Modelling Numer. Anal. (1), Studia Univ. Babeș-Bolyai Math. (1), J. Numer. Anal. Approx. Theory (4)
- R. Precup: J. Optim. Theory (1); Fixed Point Theory (2); Results in Mathematics (1); Mathematica (3); Qualitative Theory of Dynamical Systems (4); Studia Univ. Babes-Bolyai Math. (6);
- N. Suciu: Comput. Appl. Math. (3), J. Numer. Anal. Approx. Theory (2)

- O. Agratini, for Grant ERG, Lucian Blaga University, Sibiu (May, 2023)

- R. Precup: 1 book review
- M. Nechita: 2 = book review + book review
- I. Boros: 3 = book review + book review + book review.

for Mathematical Reviews:

- O. Agratini: MR4514184, MR4560303
- R. Precup: MR4530439
- C. Mustăța (honorary member): MR4624439, MR4602447, MR4595224, MR4582566, MR4573496.

For ZBL Math:

- R. Precup: Zbl 1526.49011.
- C.I. Gheorghiu: Zbl 07760983, Zbl 1522.65202, Zbl 1522.65235, Zbl 1520.76050, Zbl 1520.76051, Zbl 1517.65114, Zbl 1506.65219, Zbl 1502.65225.