Thursday, April 11th 
Nicola Vassena (Freie Universität Berlin) 
Kernel and cokernels in chemical reaction networks 
In the frame of a signed sensitivity analysis of chemical reaction networks, in this talk
I will focus on the crucial role played by onedimensional kernels and cokernels of certain minor of the stoichiometric matrix.

Thursday, April 18th 
Alejandro López Nieto (Freie Universität Berlin) 
Pattern formation in differential delay equations with monotone feedback 
Thursday, April 26th 
Maximilian Bee (Freie Universität Berlin) 
Zeta and circles  how to and how not to do it. 
I treat the partial sums of the zeta function with the trapezoid and the Euler summation formulae. The latter gives the desired result, the former does not.

Dennis Chemnitz (Freie Universität Berlin) 
An algebraic approach to proving Sharkovskii's theorem. 
Prof. Dr. Bernold Fiedler (Freie Universität Berlin) 
Absolute Truth  a toxic chimera? 
The universal prerogative of religion over ethical education is much contested today as oldfashioned, outdated and obsolete, private and subjective, unscientific, sectarian, our outright abusive.
Natural Science, in contrast, is considered beyond dispute, even though her ethical record is equally dubious, at best. In education, science is mostly taught, and misunderstood, as a fixed canon of known facts. Science is presented as established Laws of Nature, carved in stone in the unfortunately inscrutable symbolism of mathematics.
Both equally beyond the doubt of mortals, religion and mathematics come gilded with the value of truth  for seemingly diametrically opposite reasons. Be their concepts based on pure logic or pure faith: both appear as last vestiges of Absolute Truth, in an otherwise pluralistic mind set. Both appear enshrouded with the mystique of the unfathomable. And neither is thought of as subject to majority vote  quite contrary to the pacifying relativism of "everyone has their own truth". How come we still dare teach the undemocratic absolutes of mathematics? and religion?
Our provocative apologetics mostly explores the mathematical side, seeking complementary feedback, critique, and further education.

Thursday, May 2nd 
Phillipo Lappicy (Universidade de Sao Paulo; Universidade de Lisboa) 
Nonautonomous ChafeeInfante attractors: a connection matrix approach 
The goal of this talk is to present the construction of the global attractor for a genuine nonautonomous variant of the ChafeeInfante parabolic equation in one spatial dimension. In particular, the attractor consists of asymptotic profiles (which correspond to the equilibria in the autonomous counterpart) and heteroclinic solutions between those profiles. We prove the existence of heteroclinic connections between such asymptotic profiles, yielding the same connection structure as the wellknown ChafeeInfante attractor.
This work is still an ongoing project with Alexandre N. Carvalho (ICMC  Universidade de Sao Paulo).

Jeffrey Guhin (Assistant Professor of Sociology, UCLA) 
Sociological Equilibrium 
Thursday, May 9th 
Babette de Wolff (Freie Universität Berlin) 
The pseudospectral approximation method for delay differential equations 
C. Güdücü (Technische Universität Berlin) and R. Morandin (Technische Universität Berlin) 
Introduction and Numerical Methods for PortHamiltonian Systems 
Part I. In this talk we introduce portHamiltonian (pH) systems and their underlying Dirac structures. Then, we proceed to show some properties and a coordinatebased representation of pH systems, together with a toy example. Finally, we present the Lanczos method for the solution of linear systems with nonsymmetric coefficient matrices and its application to pH systems.
Part II. In this part we introduce a larger class of pH systems, that include implicit algebraic constraints, known as portHamiltonian descriptor systems or pHDAEs. We exhibit some properties of pHDAEs and present some ideas on how to control a pH system through an example. Assuming that we still have time, we conclude by illustrating collocation methods for the numerical solution of pHDAEs.

Friday, May 17th 
SFB910 Symposium 
Symposium's Programme 
Thursday, May 23rd 
Hannes Stuke (Freie Universität Berlin) 
An Introduction to Bayes Optimal Active Learning 
Thursday, June 6th 
Nicola Vassena (Freie Universität Berlin) 
Good children and bad children 
I will rehearse for a talk, which I am giving in a workshop on Chemical Reaction Networks at Politecnico of Torino and (up to small modifications) in a SIAM Conference on Applied Algebraic Geometry in Bern.
I have already presented in the past winter semester the mathematical content.

Babette de Wolff (Freie Universität Berlin) 
Pseudospectral approximation for bifurcation problems in delay equations 
Pseudospectral approximation of delay equations was introduced in 2005 by Breda et al. as a numerical method to approximate eigenvalues of delay equations by eigenvalues of ordinary differential equations.
The pseudospectral approximation has a natural interpretation as a discretisation of the delay equation in the sunstarframework. Therefore, the approximating ordinary differential equations `inherit' the structure from the delay equation. Because of this, it has been conjectured that the pseudospectral method can be used as a numerical method for bifurcation problems in delay equations.
In this talk, this topic will be adressed in the context of the Hopf bifurcation. In particular, we will discuss the way in which `direction of bifurcation' (i.e. the sign of the Lyapunov coefficient) is preserved in the pseudospectral approximation.
This is joint work with Odo Diekmann, Francesca Scarabel and Sjoerd Verduyn Lunel.

Alejandro López Nieto (Freie Universität Berlin) 
Characterization of periodic solutions for scalar delay equations with monotone feedback and evenodd symmetry 
A standard technique in the study of periodic solutions to a delay differential equation (DDE) is the reduction to an ordinary differential equation (ODE) whose periodic solutions happen to solve the original DDE via a symmetry assumption. In such a way one can at least prove the existence of some periodic solutions, but not necessarily all of them.
In the talk I will present sufficient conditions that allow to fully characterize the periodic solutions of a DDE in terms of an underlying ODE system.

Thursday, June 13th 
SFB910 internal project discussion 
with guest Si Mohamed Sah (Technical University of Denmark) 
Thursday, June 27th 
Gentaro Masuda (Freie Universität Berlin) 
Hamiltonian Delay Equations 
We extend the concept of Hamiltonian delay equations to symplectic manifolds. As an application,
we will see a certain class of Hamiltonian delay equations to which Arnold’s conjecture applies.

David Hering (Technische Universität Berlin) 
Application of Equivariant Pyragas Control on Networks of Chemical Oscillators 
Thursday, July 4th 
Angel Crespo Blanco (Technische Universität Berlin) 
Ergodic theory and statistical mechanics 
Ergodic theory is a branch of mathematics which was born in the late nineteenth century in the wake of a problem posed in the foundation of statistical mechanics:
ergodic hypothesis. Verification of this hypothesis would justify the microcanonical ensemble only from the microscopic dynamics of the system.
In this talk elementary ergodic theory results will be introduced in order to comprehend this problem. Using this tools ergodic hypothesis will be posed, in addition to comparing it with other classical approaches to the microcanonical ensemble.
Finally, current situation of the problem will be presented, which is still an open problem in spite of huge efforts that have been made by many authors.

Tilman Glorius (Freie Universität Berlin) 
NonStandard Orbits in a PyragasControlled System 
Friday, July 12th 
Yuya Tokuta (Freie Universität Berlin), Disputation 
Irreversible processes and the Jarzynski equality 
In the real world, phenomena we observe often involve irreversible processes due to friction, viscosity, heat conduction, and so on, resulting
in some energy loss as heat waste. Phenomena that involve irreversible processes are called nonequilibrium phenomena and statistical mechanics has
been trying to explain such phenomena from a microscopic point of view. In 1997, Christopher Jarzynski discovered an equation between the nonequilibrium
work and the Helmholtz free energy, which is called the Jarzynski equality. In this talk, we will prove the Jarzynski equality without assuming
familiarity with thermodynamics or statistical mechanics.
