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Comment: He is notable. However, a major rewrite is needed:*Sources needed for career*Too many minor details, for instance almost all of the "contributions to the training...". Those go in proposals, not here.*Reviewer of MS/PhD is routine and should be removed, look at WP:MILL*Contributions to society matter, but must all be sourced.This is not everything. Look at other bios. Ldm1954 (talk) 02:40, 9 March 2024 (UTC)
![]() | This article is an autobiography or has been extensively edited by the subject or by someone connected to the subject. (February 2024) |
Delfim F. M. Torres | |
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Born | Nampula, Mozambique | 16 August 1971
Nationality | Portuguese |
Alma mater | |
Known for | Work in Calculus of variations and Optimal Control |
Scientific career | |
Fields | Mathematics |
Institutions | University of Aveiro |
Thesis | Regularity of Minimizers in the Calculus of Variations and Optimal Control (2002) |
Website | https://orcid.org/0000-0001-8641-2505 |
Delfim Fernando Marado Torres (Delfim F. M. Torres) is a Portuguese mathematician known for his contributions to the calculus of variations, optimal control, fractional calculus, time scales, and mathematical biology, e.g. by the so-called Mozyrska-Torres logarithm. He is a Full Professor of Mathematics at University of Aveiro..[1][1]
Scientific and professional profile and career
editDelfim F. M. Torres, a Portuguese Mathematician born in Mozambique in 1971, graduated with top honors in Computer Science from University of Coimbra (UC) in 1994. During 1993/94, he held a JNICT fellowship as a Junior Researcher at UC's Institute of Biomedical Research on Light and Image, collaborating with doctors from the Hospital of UC and a team of Engineers on retinal structures and lesions.
Torres secured a competitive Teaching Assistant position in Mathematics at University of Aveiro (UA) in 1994 and completed his Master's in Optimization and Control Theory from UA's Department of Mathematics (DMat) in 1998. He was then promoted to Assistant Lecturer.
In 1999, Torres was awarded a PRODEP fellowship to pursue his PhD under Prof. A. Sarychev's guidance. He defended his PhD thesis in 2002, titled 'Regularity of Minimizers in the Calculus of Variations and Optimal Control', before being appointed Assistant Professor.
Torres' academic journey continued as he earned an international competitive position of Associate Professor at DMat in 2006. He obtained tenure in 2010 and assumed leadership of the Systems and Control Group, leading a research team with more than 20 members. In 2011, he obtained his DSc (Agregação) in Mathematics and, in 2013, became the Director of the PhD Program in Applied Mathematics of Univ. of Minho, Aveiro, and Porto.
In 2015, Torres earned an international competitive position of Full Professor of Mathematics at UA and, from 2018 onwards, he has served as the Director of CIDMA - the largest Mathematics R&D Center in Portugal, with more than 200 researchers. His primary research interests include calculus of variations, optimal control, optimization, fractional operators, dynamic equations on time scales, and BioMath.
Torres has extensive supervision experience, with 26 PhD theses completed under his guidance.[2] Since 2019, he has been a Member of the Advisory Board of Commun. Nonlinear Sci. Numer. Simulat.[3] and, as of 2022, a Member of the Doctoral School Advisory Council of UA.
Contributions to science and society
editContributions to the generation of new ideas, tools, methodologies or knowledge
editTorres' initial contributions in the Calculus of Variations (CV) and Optimal Control (OC) involved a novel approach to Lipschitz regularity of minimizing trajectories. He achieved this by generalizing the classical Noether's symmetry theorem to OC problems, extending the concept of invariance. His findings establish a relationship between the quasi-symmetries of problems and the conservation laws for Pontryagin extremals. Using these conservation laws, Torres obtained the first results in the literature concerning the Lipschitz regularity of minimizing trajectories for OC problems with nonlinear dynamics. Even for problems with linear dynamics, such as those in the CV, his results were groundbreaking, see e.g. [4][5][6].
Since 2006, Torres has been developing the theory of CV and OC with his students to better explain and predict the behavior of nature in 2 different directions: through fractional calculus (FC) and through time scales (TS).
In 1931, Bauer proved the impossibility of deriving a single linear dissipative equation of motion with constant coefficients using Variational Principles (VP). Bauer's theorem underscores the commonly held belief that there is no direct approach to applying VP to nonconservative systems, which involve friction or other dissipative processes. FC offers an elegant solution to this challenge. While Bauer's theorem is based on the assumption that all derivatives are of integer order, constructing a Lagrangian using fractional derivatives allows for nonconservative equations of motion. The first nonconservative Noether's theorems in the CV and OC via FC were obtained in Aveiro, see [7][8].
Existence of solutions to the Fractional CV (FCV) were also obtained by Torres and two other PhD students, by introducing suitable space of functions and general assumptions of regularity, coercivity, and convexity, see [9].
The four celebrated books on FCV [10][11][12][13] were all conceived at the University of Aveiro.
Torres' work is also the first to show that for any variational symmetry of the problem of the CV on TS, there exists a conserved quantity along the respective Euler-Lagrange extremals [14].
Both theories of fractional differential equations and dynamic equations on TS received intensive independent research. The question of integrating the two subjects was first raised by Torres. The pioneering work is that of [15][16]. This work is part of Bastos' PhD thesis, defended in Aveiro in 2012. After the pioneer work of Torres and his two PhD students, the study of fractional calculus on TS developed in a popular research subject. It should be mentioned that the new theory is relevant on real applications, e.g. in the study of calcium ion channels that are retarded with injection of calcium-chelator Ethylene Glycol Tetraacetic Acid; in the investigation of nonlocal thermally sensitive resistors on arbitrary TS; or to obtain symmetries of Birkhoffian systems.
Torres has received several awards in recognition of his contributions to knowledge generation. We mention here the Grunvald-Letnikov Award, cf. [17], and the Yang-Hui Award attributed in 2023 by the Long Shan Mathematical Foundation [2] [3], as international recognition for his outstanding works throughout his career in Mathematics, particularly for his seminal contributions to the mathematical modeling of COVID-19 and optimal control, see e.g. [18][19].
Contributions to the training and career development of researchers and/or research teams
editFrom 2005 to 2006, Torres assumed responsibility for the projects "Impedance Change and the Calculus of Variations" and "Analytical Solutions to Magnetohydrodynamical Control Problems on a Flow of Conducting Fluid" as part of the Multi-partner Marie Curie Training Site known as the "Control Training Site". The two PhD students trained by Torres at UA under these projects are currently Assistant Professors at Riga Technical University.
From 2008 to 2010, Torres supervised Dr. Agnieszka Malinowska, who worked with him on the project "Multiobjective optimal control problems and related issues" funded by a Polish fellowship. Dr. Malinowska currently holds the position of Full Professor and Managing Director at Bialystok University of Technology.
From 2011 to 2014, Torres served as a Key Scientist in the European SADCO (Sensitivity Analysis for Deterministic Controller Design) Project, funded under the Marie Curie Action “Networks for Initial Training”.
From 2013 to 2017, Torres served as a member of the Program Committee and as an Associate Editor (Full Papers) for The SIAM Conference on Control and Its Applications held in San Diego, Paris, and Pittsburgh.
In 2019, Torres founded the BioMath Thematic Line, which currently comprises 20 members from four different Research Groups of CIDMA.
From 2020 to 2023, as Director and Scientific Leader of CIDMA, Torres managed a Base Funding of 1185 KEuro[20] along with Programmatic Funding of 654 KEuro[21]
Over the years, Torres has successfully supervised 15 Master's students, 26 PhD students[22], and 13 Post-docs. His former PhD students now hold positions in various countries, including Gastão Frederico at UFC; Cristiana Silva at Iscte; Tatiana Odzijewicz at SGH Warsaw School of Economics; and Shakoor Pooseh at University of Freiburg. Additionally, Torres acted as the Host PhD Advisor for 14 PhD students who joined him at UA based on recommendations from their supervisors. These students received funding from their respective countries.
Contributions to the scientific community
editTorres has served as an Editor and Guest Editor for several journals, including Commun. Nonlinear Sci. Numer. Simul., Discrete Contin. Dyn. Syst., and Eur. J. Control. He has also been an Editor for conferences such as the SIAM Conference on Control and Its Applications and Progress on Difference Equations. Furthermore, Torres has served as an Editor for books published by Springer, Academic Press, and Chapman & Hall.
Torres served as a reviewer for numerous MSc and PhD theses, both nationally and internationally, as well as for MathSciNet and zbMATH databases and research project proposals, e.g. in the Calculus of Variations at the University of Padova in 2012. In recognition of his contributions to peer review, Torres received a Sentinel of Science Award in 2016, placing him in the top 10% of researchers in Mathematics. He also received a Publons Peer Review Award in 2017, ranking him as the world's top peer reviewer, placing him in the top 1%. Additionally, from 2013 to 2014, Torres served as a Member of the FCT Evaluation Panel (Mathematics) for applications to PhD and post-doc fellowships.
Over the years, Torres has chaired and been a member of the organizing committee for over 30 conferences and workshops. He has also organized special/invited sessions, mini-courses, thematic sessions and contests.
Ten female mathematicians completed their PhD theses under Professor Torres' supervision. The IMAME'2024 conference in Morocco recognizes his significant contributions to Africa.
Contributions to society
editTorres has made significant societal contributions, enhancing public engagement and knowledge transfer across various sectors. Some highlights include:
- National radio interviews, such as on the CLICK Program of Antena 1, where his research on dengue was discussed.
- Coverage in national newspapers, including features in Jornal de Notícias and Expresso, where Torres presented his innovative mathematical models addressing societal issues like unemployment.
- Recognition in national magazines, with features on his work in combating infections like HIV/Tuberculosis.
- International exposure through news from foreign universities, e.g. showcasing Torres' contributions to mathematical modeling in addressing global health challenges, University of Vigo, Spain, regarding COVID-19.
- TV appearances, both nationally and internationally, e.g. Torres was featured on TVI 24 and interviewed multiple times on Cape Verde television, showcasing his dedication to promoting mathematics education and research.
- Invitations to give talks in secondary schools, both domestically and internationally, reflecting his commitment to education and public outreach.
- A European patent titled "Control method for trajectory tracking of a dynamic system and respective device" was deposited on January 5, 2024, with Torres' as one of the inventors.
Torres' impact extends beyond academia, as evidenced by his diverse engagements to address pressing societal issues through innovative research and public initiatives.
Scientific production and/or selected activities (2018-2023)
editFrom 2018 to 2023, Torres co-authored 159 publications with 157 colleagues from 30 different countries across Asia, Africa, North America, South America, Europe, and Australia. His 5 main research areas during this period are:
- Biology and other natural sciences (MSC 92), where main contributions lie in Epidemiology, Population dynamics, Pest management, and Medical applications.
- Calculus of variations and optimal control; optimization (MSC 49), where Torres advanced knowledge on Optimality conditions, Existence theories, and various other miscellaneous topics.
- Real functions (MSC 26), with important contributions on Inequalities, Fractional derivatives and integrals, Real analysis on time scales, and Integrals of Riemann, Stieltjes, and Lebesgue type.
- Ordinary differential equations (MSC 34), where he had an impact on Stability theory, Fractional ODEs, Functional-differential equations, and their Qualitative theory.
- Numerical analysis (MSC 65), with relevant results in Finite difference and finite volume methods for ODEs, and Numerical methods for integral equations and time-dependent initial/boundary value problems.
One article for each of these 5 areas is:
- M. Bohner, S. Streipert, D. F. M. Torres, Exact solution to a dynamic SIR model, Nonlinear Anal. Hybrid Syst. 32 (2019), 228-238. Torres' main role was the idea on how to obtain the exact solution to a SIR model on arbitrary time scales.[23]
- A. Piunovskiy, A. Plakhov, D. F. M. Torres, Yi Zhang, Optimal impulse control of dynamical systems, SIAM J. Control Optim. 57 (2019), 2720-2752. Torres' main role was the optimal impulse control of SIR epidemics.[24]
- D. F. M. Torres, Cauchy's formula on nonempty closed sets and a new notion of Riemann-Liouville fractional integral on time scales, Appl. Math. Lett. 121 (2021), 107407.[25]
- J. V. da C. Sousa, D. S. Oliveira, G. S. F. Frederico, D. F. M. Torres, Existence, uniqueness, and controllability for Hilfer differential equations on time scales, Math. Methods Appl. Sci. 46 (2023), 12378-12401. Torres' main role was the study of psi-Riemann-Liouville fractional integrals with respect to a function psi on time scales.[26]
- S. Nemati, P. M. Lima, D. F. M. Torres, Numerical solution of a class of third-kind Volterra integral equations using Jacobi wavelets, Numer. Algorithms 86 (2021), 675-691. Torres' main role was on the approximation errors.[27]
Books by Delfim F. M. Torres
editTextbooks
edit- Delfim Fernando Marado Torres, Introdução à Programação em Lógica, Univ. Aveiro, Janeiro de 2000 (346pp, ISBN 972-8021-93-3)
- Delfim Fernando Marado Torres, Programação Matemática, UA Editora, Universidade de Aveiro, 2021 (102pp, ISBN: 978-972-789-674-5).
Research books
edit- A. Gugushvili, O. Khutsishvili, V. Sesadze, G. Dalakishvili, N. Mchedlishvili, T. Khutsishvili, V. Kekenadze and D. F. M. Torres, Symmetries and Conservation Laws in Optimal Control Systems, Georgian Technical University, Tbilisi, 2003 (249pp, ISBN:99940-14-53-6)
- A. B. Malinowska and D. F. M. Torres, Introduction to the fractional calculus of variations, Imperial College Press, London, 2012 (xvi+275pp, ISBN:978-1-84816-966-1)
- A. B. Malinowska and D. F. M. Torres, Quantum variational calculus, Springer, Cham, 2014 (xviii+84 pp, ISBN:978-3-319-02746-3, ISBN:978-3-319-02747-0)
- R. Almeida, S. Pooseh, D. F. M. Torres, Computational methods in the fractional calculus of variations, Imperial College Press, London, 2015 (xii+266 pp.; ISBN:978-1-78326-640-1)
- A. B. Malinowska, T. Odzijewicz and D. F. M. Torres, Advanced methods in the fractional calculus of variations, Springer, Cham, 2015 (xii+135 pp, ISBN:978-3-319-14755-0, ISBN:978-3-319-14756-7)
- R. Almeida, D. Tavares and D. F. M. Torres, The variable-order fractional calculus of variations, Springer, Cham, 2019 (xiv+124 pp, ISBN:978-3-319-94005-2, ISBN:978-3-319-94006-9)
- P. Agarwal, J. J. Nieto, M. Ruzhansky and D. F. M. Torres, Analysis of infectious disease problems (COVID-19) and their global impact, Springer, Singapore, 2021 (xxiv+627pp, ISBN:978-981-16-2449-0, ISBN:978-981-16-2450-6)
- P. Agarwal, J. J. Nieto and D. F. M. Torres, Mathematical Analysis of Infectious Diseases, Academic Press, London, 2022 (ISBN:978-0-323-90504-6)
- T. V. Tchemisova, D. F. M. Torres and A. Yu. Plakhov, Dynamic control and optimization, Springer, Cham, 2022 (x+243pp, ISBN:978-3-031-17557-2, ISBN:978-3-031-17558-9)
- P. Debnath, D. F. M. Torres and Y. Je Cho, Advanced Mathematical Analysis and its Applications, Chapman & Hall, Boca Raton, FL, 2024 (ISBN:978-1-032-48151-7, ISBN:978-1-032-48369-6, ISBN:978-1-003-38867-8)
References
edit- ^ Aveiro, Universidade de. "Universidade de Aveiro". Universidade de Aveiro (in Portuguese). Retrieved 4 March 2024.
- ^ "Delfim Torres - The Mathematics Genealogy Project". www.genealogy.math.ndsu.nodak.edu. Retrieved 4 March 2024.
- ^ "Communications in Nonlinear Science and Numerical Simulation | Journal | ScienceDirect.com by Elsevier". www.sciencedirect.com. Retrieved 4 March 2024.
- ^ Torres, D.F.M. (January 2002). "On the Noether Theorem for Optimal Control". European Journal of Control. 8 (1): 56–63. doi:10.3166/ejc.8.56-63. S2CID 8457538.
- ^ Torres, Delfim F. M. (1 September 2003). "Lipschitzian Regularity of the Minimizing Trajectories for Nonlinear Optimal Control Problems". Mathematics of Control, Signals, and Systems (MCSS). 16 (2–3): 158–174. arXiv:math/0212103. Bibcode:2003MCSS...16..158T. doi:10.1007/s00498-003-0132-x. ISSN 0932-4194. S2CID 14874460.
- ^ Torres, Delfim (June 2004). "Proper extensions of Noether's symmetry theorem for nonsmooth extremals of the calculus of variations". Communications on Pure and Applied Analysis. 3 (3): 491–500. doi:10.3934/cpaa.2004.3.491. ISSN 1534-0392. S2CID 3105545.
- ^ Frederico, Gastão S.F.; Torres, Delfim F.M. (October 2007). "A formulation of Noether's theorem for fractional problems of the calculus of variations". Journal of Mathematical Analysis and Applications. 334 (2): 834–846. arXiv:math/0701187. Bibcode:2007JMAA..334..834F. doi:10.1016/j.jmaa.2007.01.013. S2CID 16450599.
- ^ Frederico, Gastão S. F.; Torres, Delfim F. M. (August 2008). "Fractional conservation laws in optimal control theory". Nonlinear Dynamics. 53 (3): 215–222. arXiv:0711.0609. doi:10.1007/s11071-007-9309-z. ISSN 0924-090X. S2CID 13984113.
- ^ Bourdin, Loïc; Odzijewicz, Tatiana; Torres, Delfim F.M. (1 July 2014). "Existence of minimizers for generalized Lagrangian functionals and a necessary optimality condition – Application to fractional variational problems". Differential and Integral Equations. 27 (7/8). arXiv:1403.3937. doi:10.57262/die/1399395751. ISSN 0893-4983.
- ^ Malinowska, Agnieszka B; Torres, Delfim F M (December 2012). Introduction to the Fractional Calculus of Variations. IMPERIAL COLLEGE PRESS. doi:10.1142/p871. ISBN 978-1-84816-966-1.
- ^ Almeida, Ricardo; Pooseh, Shakoor; Torres, Delfim F M (May 2015). Computational Methods in the Fractional Calculus of Variations. IMPERIAL COLLEGE PRESS. doi:10.1142/p991. ISBN 978-1-78326-640-1. S2CID 118845080.
- ^ Malinowska, Agnieszka B.; Odzijewicz, Tatiana; Torres, Delfim F.M. (2015). Advanced Methods in the Fractional Calculus of Variations. SpringerBriefs in Applied Sciences and Technology. Cham: Springer International Publishing. doi:10.1007/978-3-319-14756-7. ISBN 978-3-319-14755-0.
- ^ Almeida, Ricardo; Tavares, Dina; Torres, Delfim F. M. (2019). The Variable-Order Fractional Calculus of Variations. SpringerBriefs in Applied Sciences and Technology. Cham: Springer International Publishing. doi:10.1007/978-3-319-94006-9. ISBN 978-3-319-94005-2. S2CID 119645424.
- ^ Bartosiewicz, Zbigniew; Torres, Delfim F.M. (June 2008). "Noether's theorem on time scales". Journal of Mathematical Analysis and Applications. 342 (2): 1220–1226. arXiv:0709.0400. Bibcode:2008JMAA..342.1220B. doi:10.1016/j.jmaa.2008.01.018. S2CID 14666137.
- ^ R. O. Bastos, Nuno; A. C. Ferreira, Rui; F. M. Torres, Delfim (2011). "Necessary optimality conditions for fractional difference problems of the calculus of variations". Discrete & Continuous Dynamical Systems - A. 29 (2): 417–437. doi:10.3934/dcds.2011.29.417. ISSN 1553-5231.
- ^ Bastos, Nuno R.O.; Ferreira, Rui A.C.; Torres, Delfim F.M. (March 2011). "Discrete-time fractional variational problems". Signal Processing. 91 (3): 513–524. arXiv:1005.0252. Bibcode:2011SigPr..91..513B. doi:10.1016/j.sigpro.2010.05.001. S2CID 17926704.
- ^ Odzijewicz, Tatiana; Malinowska, Agnieszka B.; Torres, Delfim F. M. (March 2013). "Green's theorem for generalized fractional derivatives". Fractional Calculus and Applied Analysis. 16 (1): 64–75. doi:10.2478/s13540-013-0005-z. ISSN 1311-0454.
- ^ Ndaïrou, Faïçal; Area, Iván; Nieto, Juan J.; Torres, Delfim F.M. (June 2020). "Mathematical modeling of COVID-19 transmission dynamics with a case study of Wuhan". Chaos, Solitons & Fractals. 135: 109846. arXiv:2004.10885. Bibcode:2020CSF...13509846N. doi:10.1016/j.chaos.2020.109846. PMC 7184012. PMID 32341628.
- ^ Agarwal, Praveen; Nieto, Juan J.; Ruzhansky, Michael; Torres, Delfim F. M., eds. (2021). Analysis of Infectious Disease Problems (Covid-19) and Their Global Impact. Infosys Science Foundation Series. Singapore: Springer Singapore. doi:10.1007/978-981-16-2450-6. ISBN 978-981-16-2449-0. S2CID 244573367.
- ^ "Center for Research and Development in Mathematics and Applications (157514UID) | SCIPROJ". 1 January 2020. doi:10.54499/uidb/04106/2020.
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(help) - ^ "Center for Research and Development in Mathematics and Applications (157829UID) | SCIPROJ". 1 January 2020. doi:10.54499/uidp/04106/2020.
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(help) - ^ "Delfim Torres - The Mathematics Genealogy Project". www.genealogy.math.ndsu.nodak.edu. Retrieved 4 March 2024.
- ^ Bohner, Martin; Streipert, Sabrina; Torres, Delfim F.M. (May 2019). "Exact solution to a dynamic SIR model". Nonlinear Analysis: Hybrid Systems. 32: 228–238. arXiv:1812.09759. doi:10.1016/j.nahs.2018.12.005. S2CID 119135218.
- ^ Piunovskiy, Alexey; Plakhov, Alexander; Torres, Delfim F. M.; Zhang, Yi (January 2019). "Optimal Impulse Control of Dynamical Systems". SIAM Journal on Control and Optimization. 57 (4): 2720–2752. arXiv:1802.09809. doi:10.1137/18M1212069. ISSN 0363-0129. S2CID 119141950.
- ^ Torres, Delfim F.M. (November 2021). "Cauchy's formula on nonempty closed sets and a new notion of Riemann–Liouville fractional integral on time scales". Applied Mathematics Letters. 121: 107407. arXiv:2105.04921. doi:10.1016/j.aml.2021.107407. hdl:10773/31391. S2CID 234357649.
- ^ Sousa, José Vanterler da C.; Oliveira, Daniela S.; Frederico, Gastão S. F.; Torres, Delfim F. M. (August 2023). "Existence, uniqueness, and controllability for Hilfer differential equations on times scales". Mathematical Methods in the Applied Sciences. 46 (12): 12378–12401. arXiv:2302.12183. Bibcode:2023MMAS...4612378S. doi:10.1002/mma.9183. ISSN 0170-4214. S2CID 257102749.
- ^ Nemati, S.; Lima, Pedro M.; Torres, Delfim F. M. (February 2021). "Numerical solution of a class of third-kind Volterra integral equations using Jacobi wavelets". Numerical Algorithms. 86 (2): 675–691. arXiv:2002.04736. doi:10.1007/s11075-020-00906-9. ISSN 1017-1398. S2CID 211082628.
External links for Delfim F. M. Torres
edit- Google Scholar
- ORCID
- arXiv
- African Scientist born in Mozambique
- Mathematics Genealogy
- ISI Web of Science
- Scopus
- MathSciNet
- zbMATH
- ResearchGate
- University of Aveiro
- SI in his honor, 2018
- Book in his honor, 2023
- Conference in his honor, Morocco, 2024
- Encyclopedia
- Curriculum Vitae
Category:Living people Category:University of Coimbra alumni Category:University of Aveiro alumni Category:Portuguese mathematicians Category:20th-century Portuguese mathematicians Category:21st-century Portuguese mathematicians Category:Mozambican mathematicians Category:University of Aveiro Aveiro Nampula