The next meeting of the Seminar of the Department of Operations Research, Probability and Statistics will be held online on November 11, 2020, at 2 p.m. A talk on: Nonlinear differential inclusions in Banach space with nonlocal initial conditions will be delivered by Pavlina Rumcheva. The seminar will be held via Zoom and everybody is invited to join through: https://us02web.zoom.us/j/89206392495?pwd=RGdxY0RYZWp3NGpXNzFpdDFOQnJmUT09 Topic: Семинар на секция ИОВС Time: Nov 11, 2020 14:00 Sofia Meeting ID: 892 0639 2495 Passcode: 671052

The next meeting of the Seminar of the Department of Operations Research, Probability and Statistics will be held virtually on September 29, 2020, at 2 p.m. A talk on: Nonlinear differential inclusions in Banach space with nonlocal initial conditions will be delivered by Tzanko Donchev, University of Architecture and Civil Engineering, Sofia. The seminar will be held via Zoom and everybody is invited to join through: https://us04web.zoom.us/j/77801200864?pwd=MUNpaFFnU3VXV20wcGF4NkFGbmk0Zz09 Topic: Seminar IOVS Time: Sep 29, 2020 02:00 PM Sofia Meeting ID: 778 0120 0864 Passcode: 5s6E2a Abstract

The next meeting of the Seminar of the Department of Operations Research, Probability and Statistics will be held virtually on July 21, 2020, at 4 p.m. A talk on: The TVBG-SEIR spline model for analysis of COVID-19 spread, and a Tool for prediction scenarios will be delivered by Prof. Ognyan Kounchev. The seminar will be held via Zoom and everybody is invited to join through: https://us02web.zoom.us/j/82270683091?pwd=MDN0SGsxbDlrNTlud1V0YjEyakk5UT09 Topic: Семинар на секция ИОВС Time: Jul 21, 2020 16:00 Sofia Meeting ID: 822 7068 3091 Password: 153823 Abstract

The next meeting of the Seminar on Operations Research will be held on November 19, 2019, at 2 p.m. in Room 403 of IMI. A talk on: Social Networks and Centrality Measures will be delivered by Chavdar Dangalchev. Everybody is invited..

The next meeting of the Seminar on Operations Research will be held on October 15, 2019, at 2 p.m. in Room 403 of IMI. A talk on: Subdifferential Stability and Subdifferential Sum Rules will be delivered by Marc Lassonde Abstract. In the first part, we discuss the stability of the strong slope and of the subdifferential of a lower semicontinuous function with respect to Wijsman perturbations of the function, i.e., perturbations described via Wijsman convergence. In the second part, we show how subdifferential sum rules can be viewed as special cases of subdifferential stability results. Everybody is invited..

The next meeting of the Seminar on Operations Research will be held on October 1, 2019, at 2 p.m. in Room 403 of IMI. A talk on: A topological characterization of dual strict convexity in Asplund spaces will be delivered by Richard Smith, University College Dublin, Ireland. Abstract Everybody is invited..

The next meeting of the Seminar on Operations Research will be held on July 2, 2019, at 2 p.m. in Room 403 of IMI. A talk on: On the geometry of the countably branching diamond graphs will be delivered by Denka Kutzarova-Ford. Everybody is invited..

The next meeting of the Seminar on Operations Research will be held on July 9, 2019, at 2 p.m. in Room 403 of IMI. A talk on: On complementary eigenvalue problem will be delivered by A. Iusem, Instituto de Matematika Pura e Aplicada (IMPA), Rio de Janeiro  RJ, Brazil. Abstract. We introduce the Complementary Eigenvalue Problem (EiCP), and present basic results on existence and number of solutions. We discuss next som ии  e state-of-the-art methods for its solution; namely the spectral gradient method for the symmetric case and the hybrid method (combining a semismooth Newton method with a branch and boundsearch procedure) for the nonsymmetric case. Then we consider three extensions of the problem: The Conic Complementary Eigenvalue Problem (CEiCP), the Quadratic Complementary Eigenvalue [...]