The 4th International Triennial Conference and Summer School 'Numerical Computations: Theory and Algorithms' (NUMTA2023) will be held (in hybrid format) from 14 to 20 June 2023 in Calabria, Italy, at the all-inclusive resort "Tui Magic Life Calabria" on the Tyrrhenian coast and close to the Lamezia Terme international airport. The Conference is organized by the University of Calabria, Department of Computer Engineering, Modelling, Electronics and Systems Science, Italy, in cooperation with the Society for Industrial and Applied Mathematics (SIAM), USA. Together with regular presentations at the Conference there will be the Summer School offering tutorials and discussion sections covering the topics of the Conference. Participants at the Summer School can submit either regular papers or participate at the poster session that will also be organized. English is the working language both at the Conference and the Summer School. This is the fourth edition of NUMTA (since 2013); more than 200 researchers from 30 countries around the world have attended the previous NUMTA2019 conference, Website: https://www.numta.org Main topics: Numerical analysis, computational models, optimization and machine learning, and emerging computational paradigms. Confirmed plenary lectures and tutorials: Luigi Brugnano (Italy), Lou D'Alotto (USA), Renato De Leone (Italy), Kalyanmoy Deb (USA), Francesca Mazzia (Italy), Panos Pardalos (USA), Witold Pedrycz (Canada), Yaroslav Sergeyev (Italy), Nick Trefethen (UK). Publications: A book of one-page abstracts will be available on the conference webpage. Participants regularly registered for NUMTA may also submit their full papers to the post-conference proceedings that will be published in the Springer LNCS series: short 6-8+ and long 12-15+ original research papers will be regularly peer-reviewed. Special issues of highly cited international journals will also be organized. Submission system: https://equinocs.springernature.com/service/NUMTA2023 A registration fee for in-person or virtual (zoom) participation in NUMTA2023 will be required (registration will open soon). Special benefits are reserved for the organizers of the NUMTA2023 Streams and Special Sessions. The NUMTA2023 Young Researcher Prize (500 Euros and a certificate) will be awarded to the best presentation made by a young scientist (not older than 30 years). Deadlines: April 2, 2023: One-page abstract submission April 16, 2023: Regular registration May 21, 2023: Submission of papers (short or long) for LNCS proceedings May 21, 2023: Late registration and Submission of applications for the NUMTA2023 Young Researcher Prize Information is continuously updated on the conference website https://www.numta.org where details of the three previous editions (2019, 2016 and 2013) of this conference are available. Gopal T V 0 9840121302 https://vidwan.inflibnet.ac.in/profile/57545 https://www.facebook.com/gopal.tadepalli ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Dr. T V Gopal Professor Department of Computer Science and Engineering College of Engineering Anna University Chennai - 600 025, INDIA Ph : (Off) 22351723 Extn. 3340 (Res) 24454753 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++