# Seminars

## Representation theorems for sesquilinear forms

Időpont:
2017. 10. 19. 14:00
Hely:
H601
Rosario Corso (Università degli Studi di Palermo)

## Inverse scattering: Mathematical properties of the phase shifts

Időpont:
2017. 10. 19. 10:15
Hely:
H306
Horváth Miklós

The inverse scattering is one of the most useful devices to obtain information about quantum mechanical forces. The solutions of the radial Schrödinger equation, describing mathematically the situation, behave asymptotically like sine functions with shifted phase. The sequence of these phase shifts is a central notion in scattering theory. In this talk some classical and recent results about phase shifts will be presented and some open questions will be discussed.

## Harmonikus metrikák és aszimptotikus viselkedésük

Időpont:
2017. 10. 17. 10:30
Hely:
H.306
Szabó Szilárd

## Regular Decomposition: an information and graph theoretic approach to stochastic block models

Időpont:
2017. 10. 12. 16:15
Hely:
H306
Ilkka Norros (VTT Technical Research Centre of Finland)

## Harmonikus metrikák és spinorok aszimptotikus viselkedése

Időpont:
2017. 10. 12. 14:00
Hely:
T604
Szabó Szilárd (BME Matematika Intézet)

## On the zero-stability of multistep methods on smooth nonuniform grids

Időpont:
2017. 10. 12. 10:15
Hely:
H306
Imre Fekete (Eötvös Loránd University & MTA-ELTE NUMNET)

In order to be convergent, linear multistep methods must be zero stable. While constant step size theory was established in the 1950’s, zero stability on nonuniform grids is less well understood. Here we investigate zero stability on compact intervals and smooth nonuniform grids. The grid points are constructed as the image of an equidistant grid under a smooth deformation map. We show that for all strongly stable linear multistep methods, there is an $N^*$ such that a condition of zero stability is always fulfilled for $N > N^*$ under a smoothness condition. Examples are given for Adams and BDF type methods.

## Finding patterns in Brownian motion

Időpont:
2017. 10. 05. 16:15
Hely:
H306
Hermann Thorisson (University of Iceland)

## Egy trace-egyenlőtlenség két bizonyítása

Időpont:
2017. 10. 05. 14:00
Hely:
T604
Vrana Péter (BME Matematika Intézet)

## An explicit analytic solution of a coupled first order partial and ordinary differential equation system for a discontinuous initial-boundary value problem

Időpont:
2017. 10. 05. 10:15
Hely:
H306