Previous events - Page 126

Alessandro Oneto​ (Stockholm)​ gives the Seminar in Algebra and Algebraic Geometry:

Ideals of points and Waring problems for polynomials​

Abstract: This talk addresses some of the fundamental barriers in the theory of computations. Many computational problems can be solved as follows: a sequence of approximations is created by an algorithm, and the solution to the problem is the limit of this sequence (think about computing eigenvalues of a matrix for example). However, as we demonstrate, for several basic problems in computations such as computing spectra of operators, solutions to inverse problems, roots of polynomials using rational maps, solutions to convex optimization problems, imaging problems etc. such a procedure based on one limit is impossible. Yet, one can compute solutions to these problems, but only by using several limits. This may come as a surprise, however, this touches onto the boundaries of computational mathematics. To analyze this phenomenon we use the Solvability Complexity Index (SCI). The SCI is the smallest number of limits needed in order to compute a desired quantity. The SCI phenomenon is independent of the axiomatic setup and hence any theory aiming at establishing the foundations of computational mathematics will have to include the so called SCI Hierarchy. We will specifically discuss the vast amount of classification problems in this non-collapsing complexity/computability hierarchy that occur in inverse problems, compressed sensing problems, l1 and TV optimization problems, spectral problems, PDEs and computational mathematics in general.

Welcome to the formal opening of the SIRIUS and BigInsight centers by Minister of Trade and Industry, Monica Mæland. The event continues with an opening seminar for SIRIUS.

Martin BUCHER, Directeur de Recherche, CNRS, Paris

M.Sc. Saranya Subramani at School of Pharmacy will be defending the thesis Biochemical characterization and crystallization of the magnesium transporting P-type ATPase MgtA for the degree of Ph.D.

M.Sc. Saranya Subramani ved Farmasøytisk institutt vil forsvare sin avhandling for graden ph.d: Biochemical characterization and crystallization of the magnesium transporting P-type ATPase MgtA.

What makes us us? Why do we react and process things differently, and how do things we experience shape us? And have you heard about the epigenetic clock that can predict your age? How does it work, and how can the epigenetic clock be used to study neuropsychiatric disorders?  Find out more about what happens to epigenetic marks in the initial stages of mouse development.

The conference "Quantum groups: geometry, representations, and beyond" will take place on May 9-14, 2016.

Ainar Drews, PhD , ITA

Abstract:  In a recent work with R. Conti (La Sapienza Univ., Rome), we have introduced a notion of positive definiteness for certain functions associated to a (unital, discrete) C*-dynamical system. We will sketch the proof of a Gelfand-Raikov type theorem for such functions and use it to construct complete positive maps on the full and the reduced C*-crossed products of the system. We will also explain how a natural definition of amenability for C*-dynamical systems emerges from our work. 

Welcome to the GeoHyd Lunch Seminar on Wednesday May 4th @ 12:15 in aud. 2 in the Geology building.

Lars Riber at the Department of Geosciences will be defending his dissertation: Petrographical and mineralogical changes in altered basement rocks on the Utsira High, North Sea – processes of regolith formation and comparison with analogous weathering sections

Abstract:

Marit Sandstad, Postodoctoral fellow NORDITA

Doctoral candidate Lars Riber at the Department of Geosciences will give a trial lecture on the given topic: Atmosphere - biosphere changes through time: Evidence from weathering and paleosol formation

Upcoming short presentation from post docs in meteorology and oceanography:

Speaker: Hui Tang

Title: Teach CLM4.5 to simulate Arctic vegetation and its feedbacks: some hints from EGU Assembly 2016

Timo Koski (Dept. of Mathematics, Royal Institute of Technology, Stockholm) will give a seminar in the lunch area, 8th floor Niels Henrik Abels hus at 14:15.

Welcome to the GeoHyd Lunch Seminar on Monday April 25th @ 12:15 in Aud. 2.

Jack Carlyle, Postdoc , ITA

A Scandinavian Gathering Around Remarkable Discrete Mathematics

Abstract: The talk will be on positive linear maps of the n x n matrices into itself, a topic which has become quite popular in quantum information theory.  The maps closest to physics are the completely positive ones. I´ll discuss an approximation by a completely positive map to a positive map via the trace , called the “structural physical approximation”, the SPA of the map. Much of the talk will circle around a counter example  to a conjecture on the SPA.

Sofia Tirabassi (UiB), gives the Seminar in Algebra and Algebraic Geometry:

Title: Characterization of product of theta divisors

Abstract: This is a joint work with Z. Jiang and M. Lahoz. We give a new cohomological characterization of product of theta divisors in principally polarized abelian varieties and we completely classify n-varieities with of maximal albanese dimension and with irregularity 2n-1 and euler characteristic 1, extending lower dimensional results of Hacon--Pardini. I will do my best to keep the first hour enjoyable and entertaining also for graduate students with background in algebraic geometry (and related areas).