Speaker: Prof. Stephan Wagner | Institute of Discrete Mathematics | Graz University of Technology (TU Graz)
Chairperson: Dr. Ralph Agyei Twum | Department of Mathematics | University of Ghana
Meeting ID: 396 914 344 747 824 | Passcode: kY9Ht7Uu | Teams: Link
All are cordially invited.
The classic Banach-Mazur theorem says that C[0,1] is a universal (isometrically) space for all the separable Banach spaces X. However, can we impose some extra regularity to the continuous functions representing the elements of X? We will study this problem in a more general frame with functions on a compact Hausdorff space K and regularity with respect to to a lower semicontinuous metric d defined on K.
In [5], Harte used the well-known Atkinson’s theorem (which gives a necessary and sufficient condition for a Banach space operator to be Fredholm) to introduce a Fredholm theory relative to an arbitrary Banach algebra homomorphism. In [2], Berkani defined the notion of a B-Fredholm operator - a type of generalized Fredholm operator - for which an Atkinson-type theorem was established in [3] and utilized in [4] to introduce B-Fredholm theory in general Banach algebras.
Join the OceanPrediction DCC African Seas Regional Team for our first webinar of 2026. We are pleased to welcome Dr. Joseph Kofi Ansong from the University of Ghana and Dr. Sivareddy Sanikommu from KAUST (King Abdullah University of Science and Technology), who will share their research, insights, and perspectives in an engaging online session focused on ocean science and African seas.
Event Website: Link
We look forward to seeing you there!
Ghosts refer to non-physical entities (non-human, animal) that are believed by some people to be able to appear to the living. The question is that: if they exit, how are they traveling through ordinary Euclidean space? To model this scenario, we consider a classical system of mass m moving from a point A to another point B in position-deformed Heisenberg algebra with a generalized uncertainty principle.
This paper proposes a new optimization framework to minimize geographical basis risk in weather index insurance by integrating extreme weather penalties and spatial regularization into strike temperature design. The model balances three objectives: (i) reducing payoff mismatches between local and reference stations, (ii) penalizing strike temperature that fail to account for heatwaves and cold spells, and (iii) ensuring smooth strike variations across geographically correlated stations.
