Abbreviations
FU: Freie Universität Berlin. HU: HumboltUniversität zu Berlin. Ol: Online. Ot: Other.
TBA: To be arranged. TU: Technische Universität Berlin. Ur: Urania. Vn.: Venue. WIAS: WeierstraßInstitut für Angewandte Analysis und Stochastik. ZIB: ZuseInstitut Berlin.
Dates given in the format YYYY/MM/DD. Links to the talks can be found in the symbol “”.
2022/23
Winter Semester
Talks will be in person, but we will be livestreamed as well. Feel free to approach us if you would like to give a talk!
Date  Vn.  Title of talk  Speaker  
2022/10/21  FU  What is a semialgebraic set?  Kyle Huang (FU)  
2022/11/04  HU  What is a Grothendieck topology?  Gari Yamel Peralta Alvarez (HU)  
2022/11/18   No talk   
2022/12/02  HU  What is tame geometry?  Paul BrommerWierig (FU)  
2022/12/16  TU  What is a ktensor?  Silas Rathke (FU)  
2023/01/13  TU  What is a rational variety?  Andrea Di Lorenzo (HU)  
2023/01/27  HU  What is an infinity structure?  Dingyu Yang (HU)  
2023/02/10  TU  What is backpropagation?  Shpresim Sadiku (TU, ZIB)  
2021/22
Summer Semester
The MATH+ colloquia are taking place in presence again — we will be having inperson talks (but also streamed online). Feel free to approach us if you would like to give a talk!
Date  Vn.  Title of talk  Speaker  
2022/04/29  TU  What is epidemic modeling?  Johannes Zonker (FU)  
2022/05/13  TU  What is a sphere packing?  Ji Hoon Chun (TU)  
2022/05/20   No talk   
2022/06/03  TU  What is submodularity?  Khai Van Tran (TU)  
2022/06/17  HU  What is a McKeanVlasov process?  Martha Nansubuga (HU)  
2022/07/01  HU  What is a probabilistically checkable proof?  Levent Doğan (TU)  
2022/07/15  TU  What is the generalized Poincaré conjecture?  Ekin Ergen (TU)  
Winter Semester
Due to the current situation, the MATH+ Fridays will take place online, and so will our seminar talks. Feel invited to approach us to give a virtual talk!
Date  Vn.  Title of talk  Speaker  
2021/10/22  Ol  What is rough volatility?  Simon Breneis (WIAS)  
2021/11/05   No talk   
2021/11/19  Ol  What is fair division?  Jannik Peters (TU)  
2021/12/03  Ol  What is resurgence theory?  Pierre Clavier (IRIMAS, Université de Haute Alsace)  
2021/12/17  Ol  What is a modular curve?  Marco Flores (HU)  
2022/01/14   No talk   
2022/01/28  Ol  What is a regular polytope in 3D?  Henriette Lipschütz (FU)  
2022/02/11  Ol  What is the direct method of calculus of variations?  Anastasija Pesic (HU)  
2022/02/22  Ol  What is Uncertainty Quantification?  Phillipp Wacker (FAU ErlangenNürnberg)  
2022/02/22  Ol  What is the RiemannHurwitz formula?  Dominik Gutwein (HU)  
2020/21
Summer Semester
Due to the ongoing pandemic, the MATH+ Fridays will take place online, and so will our seminar talks. Feel invited to approach us to give a virtual talk!
Date  Vn.  Title of talk  Speaker  
2021/04/16  Ol  What is a tree decomposition?  Raphael Steiner (TU)  
2021/05/07  Ol  What are Conditional Gradients?  Elias Wirth (TU/ZIB)  
2021/05/21  Ol  What is a finite simple group?  Kıvanç Ersoy (FU)  
2021/05/28   No talk   
2021/06/18   No talk   
2021/07/02  Ol  What is persistent homology?  Ivan Spirandelli (U Potsdam)  
2021/07/09  Ol  What is variational image processing?  Clemens Sirotenko (WIAS)  
2021/07/16  Ol  What is Floer homology?  Paramjit Singh (HU)  
Winter Semester
Due to the ongoing pandemic, the MATH+ Fridays will take place online, and so will our seminar talks. Feel invited to approach us to give a virtual talk!
Date  Vn.  Title of talk  Speaker  
2020/12/11  Ol  What is Noether's theorem?  Niklas Martensen (HU)  
2021/01/15  Ol  What is an expander graph?  Alp Müyesser (FU)  
2021/01/22  Ol  What is a multigrid method?  Felix Baumann (ZIB)  
2021/02/05  Ol  What is a Coulomb gas?  Gaëtan Borot (HU)  
2021/02/19   No talk   
2021/03/02  Ol  What is an image in mathematics?  Johannes von Lindheim (TU)  
2021/03/02  Ol  What is a matrix model?  Raphaël Belliard (HU)  
2019/20
Summer Semester
Due to the pandemic, the MATH+ Fridays are mostly cancelled this semester, and we cannot offer physical talks either. However, we are able to host virtual seminar talks. Feel invited to approach us to give a virtual talk!
Date  Vn.  Title of talk  Speaker  
2020/06/05  Ol  What is an ergodic decomposition of invariant measures?  Shah Faisal (HU)  
Winter Semester
Date  Vn.  Title of talk  Speaker  
2019/10/07  FU  What is the probabilistic analysis of a condition number?  Josué TonelliCueto (TU)  
2019/10/08  FU  What is a nonnegativity certificate?  Janin Heuer (TU Braunschweig)  
2019/10/09  FU  What is estimation for Gaussian models?  Carlos Amendola (TU München)  
2019/10/10  FU  What is $M_{g,n}$?  Dominic Bunnett (TU)  
2019/10/11  FU  What are 32, 462, 4224, ... counting?  JeanPhilippe Labbé (FU)  
2019/10/18  Ur  What is the point of pointless topology?  Georg Lehner (FU)  
2019/10/25   No talk   
2019/11/01   No talk   
2019/11/08  Ur  What are algebraic curves and their tropical friends?  Dominic Bunnet (TU) Marta Panizzut (TU)  
2019/11/15   No talk   
2019/11/22   No talk   
2019/11/29  Ur  What is the role of convexity in variational problems?  Janusz Ginster (HU)  
2019/12/06   No talk   
2019/12/13   No talk   
2019/12/20   No talk   
2020/01/10   No talk   
2020/01/17  Ur  What is the behavior of random graphs?  Ander Lamaison (FU)  
2020/01/10   No talk   
2020/01/31  TU  What is gaussian multiplicative chaos?  Paul Hager (TU)  
2020/02/07   No talk   
2020/02/18  Ur  What is the dimension of a partial order?  Felix Schröder (TU)  
2018/19
Summer Semester
Date  Vn.  Title of talk  Speaker  
2019/04/12  TU  What are support vector machines?  Katerina Papagiannouli (HU)  
2019/05/10   No talk   
2019/04/26  Ur  What is Steinitz's theorem?  Sophia Elia (FU)  
2019/05/03  FU  What is a g_d^r?  Carlos Maestro Pérez (HU)  
2019/05/10   No talk   
2019/05/17   No talk   
2019/05/24  Ur  What is Minkowski geometry?  Fei Xue (TU)  
2019/05/31  TU  What is a differentialalgebraic equation?  Riccardo Morandin (TU)  
2019/06/07  Ur  What are Betti numbers?  Marta Panizzut (TU)  
2019/06/14  TU  What is a regularity structure?  Tom Klose (TU)  
2019/06/21  Ur  What is Klein's $j$invariant?  Gari Yamel Peralta Álvarez (HU)  
2019/06/28   No talk   
2019/07/05  HU  What is a random walk in random environment?  AnnaLisa Sokol (TU)  
2019/07/12   No talk   
Winter Semester
Date  Vn.  Title of talk  Speaker  
2018/10/19   No talk   
2018/10/26  Ur  What is the secret of the zeta function?  Barbara Jung (HU)  
2018/11/02   No talk   
2018/11/09  Ur  What is the Euler characteristic of a polytope?  Hannah Sjöberg (FU)  
2018/11/16  TU  What is a topological surface?  Georg Lehner (FU)  
2018/11/23   No talk   
2018/11/30  Ur  What is the Alexander polynomial of a knot?  Max Krause (TU)  
2018/12/07  FU  What is the best voting system?  Josué TonelliCueto (TU)  
2018/12/14  Ur  What are tensor networks, topological order and entanglement renormalization?  Alex Nietner (FU)  
2018/12/21   No talk   
2019/01/11  FU  What are interval graphs, interval orders, and their friends?  Simona Boyadzhiyska (FU)  
2019/01/18  Ur  What is a competing species model?  Florian Nie (TU)  
2019/01/25   No talk   
2019/02/01  TU  What is a hydrodynamic limit?  Tommaso Cornelis Rosati (HU)  
2019/02/08  Ur  What is like to lower the mixed volume?  Dimitrios Bogiokas (FU)  
2019/02/15   No talk   
2019/02/19  Ur  What is the WrightFisher diffusion?  Eugenio Buzzoni (TU)  
2017/18
Summer Semester
Date  Vn.  Title of talk  Speaker  
2018/04/20   No talk   
2018/04/27  Ur  What is a matroid?  Jorge Alberto Olarte (FU)  
2018/05/04   No talk   
2018/05/11   No talk   
2018/05/18  Ur  What are Kronecker Coefficients?  Levent Doğan (TU)  
2018/05/25   No talk   
2018/06/01  Ur  What is control theory?  Alejandro López (FU)  
2018/06/08  TU  $``\vec{w}h\alpha\mathfrak{t}\;\; i\mathbb{S}\ldots\text{?''}$ Seminar 10th Anniversary What is an ultrafilter?  Peter Krautzberger 

2018/06/15  Ur  What is a scheme?  Marco D'Addezio (FU)  
2018/06/22   No talk   
2018/06/29  Ur  What are semialgebraic sets in context?  Josué TonelliCueto (TU)  
2018/07/06  FU  What is a positional game?  Alp Müyesser (Carnegie Mellon)  
2018/07/13  Ot  What is a ranking algorithm?  Benjamin Gardiner (TU)  
2018/07/20   No talk   
Winter Semester
Date  Vn.  Title of talk  Speaker  
2017/10/20   No talk   
2017/10/27  Ur  What is a random graph?  Jannes Münchmeyer (HU)  
2017/11/03  TU  What is algebraic statistics?  Carlos Améndola (TU)  
2017/11/10  Ur  What is a finite element method?  Monika Eisenmann (TU)  
2017/11/17   No talk   
2017/11/24  Ur  What is a spectrahedron?  Mario Kummer (MPI Leipzig)  
2017/12/01   No talk   
2017/12/08  TU  What are monomial tropical cones for multicriteria optimization?  Georg Loho (TU)  
2017/12/15  Ur  What is the Teichmüller space of a surface?  Lara Skuppin (TU)  
2017/12/22   No talk   
2018/01/12  TU  What are large deviations?  András Tóbiás (TU)  
2018/01/19  Ur  What are Maxwell's equations?  Marek Gluza (FU)  
2018/01/26   No talk   
2018/02/02  Ur  What is a homotopy invariant?  Alexander Müller (FU)  
2018/02/09   No talk   
2018/02/16  Ur  What is an inverse problem?  Héctor Andrade Loarca (TU)  
2018/02/20  Ur  What are molecular dynamics?  Mohsen Sadeghi (FU)  
2016/17
Summer Semester
Date  Vn.  Title of talk  Speaker  
2017/04/21  Ur  What are Hamiltonian dynamics?  Alexander Fauck (HU)  
2017/04/28  TU  What are triangulated spheres and Pachner moves?  Giulia Codenotti (FU)  
2017/05/05  Ur  What is variational inference?  Patrick Jähnichen (HU)  
2017/05/12   No talk   
2017/05/19   No talk   
2017/05/26   No talk   
2017/06/02  Ur  What is Iwasawa theory?  Marcin Lara (FU)  
2017/06/09   No talk   
2017/06/16   No talk   
2017/06/23   No talk   
2017/06/30  Ur  What are $\mathsf{BPP}$, $\mathsf{RP}$ and the other probabilistic complexity classes?  Josué Tonelli Cueto (TU)  
2017/07/07  TU  What is a condition number?  Paul Breiding (TU)  
2017/07/14  Ur  What is Onsager's conjecture?  Robert Lasarzik (TU)  
2017/07/21  FU  What is Gröbner basis doing in Sudoku?  Irem Portakal (FU)  
Winter Semester
Date  Vn.  Title of talk  Speaker  
2016/10/21  Ur  What is mixed integer linear programming?  Stanley Schade (FU/ZIB)  
2016/10/28   No talk   
2016/11/04  Ur  What is a modular form?  Antareep Mandal (HU)  
2016/11/11   No talk   
2016/11/18   No talk   
2016/11/25   No talk   
2016/12/02   No talk   
2016/12/09   No talk   
2016/12/16  Ur  What is formal mathematics?  Martin Skrodzki (FU)  
2017/01/13  Ur  What is randomness good for?  Shagnik Das (FU)  
2017/01/20   No talk   
2017/01/27  Ur  What is the length of a potato?  Josué Tonelli Cueto (TU)  
2017/02/03   No talk   
2017/02/10  Ur  What is a (discontinuous) Galerkin finite element method?  Lasse Hinrichsen (FU)  
2017/02/17   No talk   
2017/02/21  Ur  What is linear programming?  Georg Loho (FU)  
2015/16
Summer Semester
Date  Vn.  Title of talk  Speaker  
2016/04/22   No talk   
2016/04/29  Ur  What is symplectic geometry?  Mara Ungureanu (HU)  
2016/05/06   No talk   
2016/05/13  Ur  What is a Chow ring?  Fei Ren (FU)  
2016/05/20   No talk   
2016/05/27   No talk   
2016/06/03   No talk   
2016/06/10   No talk   
2016/06/17  Ur  What is an eigenvector of a tensor?  Kathlén Kohn (TU)  
2016/06/24   No talk   
2016/07/01   No talk   
2016/07/08  Ot  What is a sphere packing?  Albert Haase (FU)  
2016/07/15   No talk   
2016/07/22   No talk   
Winter Semester
Date  Vn.  Title of talk  Speaker  
2015/10/16  Ur  What is representation theory?  Patrick Da Silva (HU)  
2015/10/23   No talk   
2015/10/30  Ur  What is a period?  Filippo Nuccio (Université St. Étienne)  
2015/11/06   No talk   
2015/11/13  TU  What is reciprocity?  Jan Hofmann (FU)  
2015/11/20   No talk   
2015/11/27   No talk   
2015/12/04   No talk   
2015/12/11  Ur  What is discrete Fourier analysis?  Christoph Spiegel (FU)  
2015/12/18   No talk   
2016/01/08   No talk   
2016/01/15  Ur  What is a $p$adic number?  Claudius Heyer (HU)  
2016/01/22   No talk   
2016/01/29  Ur  What is a stochastic process?  Stefan Rüdrich (FU)  
2016/02/05  FU  What is an origami constructible number?  Josué Tonelli Cueto (HU)  
2016/02/12  Ur  What is the disjoint paths problem?  Miriam Schlöter (TU)  
2016/02/16  Ur  What is a rational function?  Irem Portakal (FU)  
2014/15
Summer Semester
Date  Vn.  Title of talk  Speaker  
2015/04/17   No talk   
2015/04/24  Ur  What is the complexity of matrix multiplication?  Pierre Lairez (TU)  
2015/05/01   No talk   
2015/05/08  TU  What is a supercritical percolation cluster?  Nguyen Tuan Anh (TU)  
2015/05/15   No talk   
2015/05/22   No talk   
2015/05/29   No talk   
2015/06/05  FU  What is a transfer operator?  Adam Nielsen (ZIB)  
2015/06/12  Ur  What is group homology?  Peter Patzt (FU)  
2015/06/19  HU  What is the heat kernel?  Asilya Suleymanova (HU)  
2015/06/26   No talk   
2015/07/03   No talk   
2015/07/10  Ur  What is Ramsey theory?  Manh Tuan Tran (FU)  
2015/07/17   No talk   
Winter Semester
Date  Vn.  Title of talk  Speaker  
2014/10/17   No talk   
2014/10/24  HU  What is a syzygy?  Daniele Agostini (HU)  
2014/10/31  Ur  What is an Ehrhart polynomial?  Hannes Pollehn (TU)  
2014/11/07   No talk   
2014/11/14  Ur  What is a $\operatorname{CAT}(0)$ space?  Sebastian Meinert (FU)  
2014/11/21   No talk   
2014/11/28  Ur  What is a (complex) hyperplane arrangement?  Arnau Padrol Sureda (FU)  
2014/12/05  FU  What is the ham sandwich theorem?  Florian Frick (TU)  
2014/12/12  Ur  What is a Hamiltonian system?  Jonathan Youett (FU)  
2014/12/19   No talk   
2015/01/09  Ur  What is sparse and redundant representation modeling for image processing?  WangQ Lim (TU)  
2015/01/16  TU  What is a van Kampen obstruction cocycle?  Isaac Mabillard (IST Austria)  
2015/01/23  FU  What is the probabilistic method?  Shagnik Das (FU)  
2015/01/30   No talk   
2015/02/06  Ur  What is (algebraic) complexity theory?  Jesko Hüttenhain (TU)  
2015/02/13   No talk   
2015/02/17  Ur  What is a scale in motion?  Thomas von Larcher (FU)  
2013/14
Summer Semester
Date  Vn.  Title of talk  Speaker  
2014/04/18   No talk   
2014/04/25  Ur  What is the NavierStokes equation?  Ariane Papke (FU)  
2014/05/02   No talk   
2014/05/09  Ur  What is a random graph?  Adam Streck (FU)  
2014/05/16   No talk   
2014/05/23  HU  What is a partial zeta function?  Miguel Grados (HU)  
2014/05/30   No talk   
2014/06/06  Ur  What is an isohedral tiling?  Michael Joos (TU)  
2014/06/13   No talk   
2014/06/20  Ur  What are the moduli spaces of curves?  Giulia Battiston (FU)  
2014/06/27  HU  What is the AtiyahSinger index theorem?  Lucas Braune (IMPA Rio de Janeiro)  
2014/07/04  Ur  What is a Riemannian manifold?  Lara Skuppin (TU)  
2014/07/11  FU  What is timeofdeath modeling?  Jonas Krone (TU) Zoi Tokoutsi (FU)  
2014/07/18  Ur  What is a gyroid?  Ulrich Reitebuch (FU)  
Winter Semester
Date  Vn.  Title of talk  Speaker  
2013/10/18  Ur  What is combinatorial rigidity?  Louis Theran (FU)  
2013/10/25  HU  What is a hyperreal number?  Uğur Doğan (HU)  
2013/11/01  Ur  What is a graph limit?  Codrut Grosu (FU)  
2013/11/08  TU  What is the relation between Laplace transform and Ztransform?  Deniz Genlik (TU)  
2013/11/15  Ur  What is the conformal geometry of surfaces?  Wayne Lam (TU)  
2013/11/22  FU  What are mean curvature flow and its selfshrinkers?  Keita Kunikawa (Tohoku Univ)  
2013/11/29  TU  What is a Wasserstein distance?  Matthias Liero (WIAS)  
2013/12/06  HU  What is a Grassmannian?  Eva Martinez (HU)  
2013/12/13  Ur  What are the Burger's equation and heat equations?  Juan Camilo Orduz (HU)  
2013/12/20   No talk   
2014/01/10  Ot  What is the representation theory of finite groups?  Peter Patzt (FU)  
2014/01/17  Ur  What is a 4D object?  Faniry Razafindrazaka (FU)  
2014/01/24  FU  What is the spacetime constraints paradigm?  Christoph von Tycowicz (FU)  
2014/01/31  Ur  What is a Carleson operator?  Yizhi Sun (TU)  
2014/02/07   No talk   
2014/02/14   No talk   
2014/02/18  Ur  What is the prime number theorem?  Ananyo Dan (HU)  
2012/13
Summer Semester
Date  Vn.  Title of talk  Speaker  
2013/04/19  Ur  What is a higher order tensor decomposition?  Max Pfeffer (TU)  
2013/04/26  HU  What is an $L$function?  Miguel Grados (HU)  
2013/05/03  Ur  What is the Nash embedding theorem?  Ariane Beier (U Potsdam)  
2013/05/10   No talk   
2013/05/17   No talk   
2013/05/24   No talk   
2013/05/31   No talk   
2013/06/07  FU  What is a subgradient?  Elias Pipping (FU)  
2013/06/14   No talk   
2013/06/21  Ur  What are abstract functions and weak convergence?  Christian Kreusler (TU)  
2013/06/28  TU  What is matrix completion?  Franz Király (TU)  
2013/07/05  Ur  What is a selfavoiding random walk?  Giovanni Conforti (HU)  
2013/07/12  Ur  What is a variational inequality?  Carsten Gräser (FU)  
2013/07/19   No talk   
Winter Semester
Date  Vn.  Title of talk  Speaker  
2012/10/19  Ur  What is a smoke ring?  Felix Jakob Knöppel (TU)  
2012/10/26  TU  What is persistent homology?  Mijail Guillemard (TU)  
2012/11/02  Ur  What is a quaternion algebra?  Christian Wald (HU)  
2012/11/09  HU  What is a BruhatTits tree?  Inder Kaur (HU)  
2012/11/16   No talk   
2012/11/23  FU  What is a regular map?  Faniry Razafindrazaka (FU)  
2012/11/30  Ur  What is a spacetime singularity?  Phillipo Lappicy (FU)  
2012/12/07  HU  What is a Hodge locus?  Ananyo Dan (HU)  
2012/12/14  Ur  What is $SU(2)$ and why does it doublecover $SO(3)$?  Florian Frick (TU)  
2012/12/21   No talk   
2013/01/11   No talk   
2013/01/18  TU  What is a quasiconformal mapping?  Isabella Thiesen (TU)  
2013/01/25  Ur  What is a $j$invariant?  Emre Sertöz (HU)  
2013/02/01  FU  What is a monotonicity formula?  Ahmad Afuni (FU)  
2013/02/08  Ur  What is a rational tangle?  Silvia de Toffoli (TU)  
2013/02/15  TU  What is a Palindromic Eigenvalue Problem?  Christian Schröder (TU)  
2013/02/19  Ur  What is a positional game?  Dennis Clemens (FU)  
2011/12
Summer Semester
Date  Vn.  Title of talk  Speaker  
2012/04/13  TU  What is a spectral method?  Maciek Korzec (TU)  
2012/04/20  Ur  What is a dissipative weak solution?  Romain Nguyen (FU)  
2012/04/27  HU  What is a pathfollowing method?  Jennifer Rasch (HU)  
2012/05/04  FU  What is software development?  Kristian Rother  
2012/05/11   No talk   
2012/05/18  TU  What is a differential inclusion?  Shahrad Jamshidi (FU)  
2012/05/25  FU  What is a configuration space?  Dror Atariah (FU)  
2012/06/01  HU  What is a problem in mathematical finance?  Julio Backhoff (HU)  
2012/06/08  Ur  What is a group action?  Mikola Lysenko (UW Madison)  
2012/06/15  TU  What is a Dirac operator?  Juan Orduz (HU)  
2012/06/22  Ur  What is the FabriciusBjerre theorem?  Felix Günther (TU)  
2012/06/29  Ur  What is a group representation?  Giovanni de Gaetano (HU)  
2012/07/06  Ur  What is Brownian motion?  Adrián Gonzalez Casanova (TU)  
2012/07/13  HU  What are $\operatorname{Ext}$ and its applications?  Hannah Enders (HU)  
Winter Semester
Date  Vn.  Title of talk  Speaker  
2011/10/21  Ur  What is diffusion?  Maciek Korzec (TU)  
2011/10/28  Ur  What is tropical geometry?  Cesar Ceballos (FU)  
2011/11/04  HU  What is a zeta function?  David Ouwehand (HU)  
2011/11/11   No talk   
2011/11/18  FU  What is a Gröbner basis in a polynomial ring?  Andre Mialebama (FU)  
2011/11/25  TU  What is the Lagrangian relaxation of an integer program?  Jonad Pulaj (ZIB)  
2011/12/02  Ur  What is a lattice in a Lie group good for?  Barbara Jung (HU)  
2011/12/09  Ur  What are propagating interfaces and level set methods?  Antoine Laurain (HU)  
2011/12/16   No talk   
2012/01/06  Ur  What is a shearlet?  WangQ Lim (TU)  
2012/01/13   No talk   
2012/01/20  Ur  What is an independent transversal?  Lothar Narins (FU)  
2012/01/27  TU  What is the connection between the Kantian intuition of mathematical objects and diagrams?  Özge Ekin (FU)  
2012/02/03  Ur  What is risk?  Samuel Drapeau (HU)  
2012/02/10  HU  What is the a Feynman integral?  Christian Bogner (HU)  
2012/02/22  Ur  What is the fundamental group and covering spaces?  Fabian Lenhardt (FU)  
2010/11
Summer Semester
Date  Vn.  Title of talk  Speaker  
2011/04/15  Ur  What is a modular form?  Anilatmaja Aryasomayajula (HU)  
2011/04/22   No talk   
2011/04/29  Ur  What is the KuhnTucker theorem?  Thomas Lehmann (ZIB)  
2011/05/06  TU  What is an infinitesimal?  Thomas El Khatib (TU)  
2011/05/13  Ur  What is a graph?  Daniel Heldt (TU)  
2011/05/20   No talk   
2011/05/27  Ur  What is the direct method in the calculus of variations?  Beatrice Bugert (WIAS)  
2011/06/03   No talk   
2011/06/10  Ur  What is a moduli space?  Fabian Müller (HU)  
2011/06/17  FU  What is a sheaf?  Nikolai Beck (FU)  
2011/06/24  Ur  What is linear programming?  Ambros Gleixner (ZIB)  
2011/07/01   No talk   
2011/07/08  Ur  What is a Green's function?  Marcel Ortgiese (TU)  
2011/07/15  HU  What is a matroid?  Markus Hihn (HU)  
Winter Semester
Date  Vn.  Title of talk  Speaker  
2010/10/22  Ur  What is a Catalan number?  JeanPhilippe Labbé (TU)  
2010/10/29  TU  What is Hilbert's 17th problem?  Moritz Schmitt (TU)  
2010/11/05  Ur  What is a stable marriage?  Ágnes Cseh (TU)  
2010/11/12  HU  What is a selflocator?  Heinrich Mellmann (HU)  
2010/11/19  FU  What is a multifunction?  Klebert Kentia (HU)  
2010/11/26  Ur  What is the origin of elliptic functions?  Barbara Jung (HU)  
2010/12/03  Ur  What is the probabilistic method?  Anita Liebenau (FU)  
2010/12/10  Ur  What is cognitive neuroscience?  Roland Friedrich (HU)  
2010/12/17   No talk   
2011/01/07  FU  What is a derived category?  Andreas Hochenegger (FU)  
2011/01/14  Ur  What is a Diophantine equation?  Stefan Keil (HU)  
2011/01/21  TU  What is a random walk on a network?  Natasa Djurdjevac (FU)  
2011/01/28  Ur  What is math blogging?  Felix Breuer (FU)  
2011/02/04  HU  What is the exit problem?  Han Lie (HU)  
2011/02/11  Ur  What is $\mathsf{P}$ vs $\mathsf{NP}$?  Jannik Matuschke (TU)  
2011/02/18  TU  What is a weak derivative?  Stefan W. von Deylen (FU)  
2011/02/22  Ur  What is a matroid?  Matthias Lenz (TU)  
2009/10
Summer Semester
Date  Vn.  Title of talk  Speaker  
2010/04/16  FU  What is Hilbert's 16th problem?  Eyal Ron (FU)  
2010/04/23  Ur  What is a theta body?  Annie Raymond (TU)  
2010/04/30  TU  What is a Killing vector field?  Mimi Tsuruga (FU)  
2010/05/07  Ur  What is a Fourier series?  Jerry Gagelman (TU)  
2010/05/14  HU  What is the big deal with math and music?  Aaron Greicius (HU)  
2010/05/21  Ur  What is a zeta function?  Nicholas Schmidt (HU)  
2010/05/28   No talk   
2010/06/04  Ur  What is a linear system of plane curves?  Angela Ortega (HU)  
2010/06/11  HU  What is the classifying space of a category?  Stephan Müller (HU)  
2010/06/18  Ur  What is Pólya theory?  Emerson Leon (TU)  
2010/06/25  FU  What is a hybrid automata?  Shahrad Jamshidi (FU)  
2010/07/02  TU  What are large deviations?  Hanna Döring (TU)  
2010/07/09  FU  What is phylogenetic algebraic geometry?  Kaie Kubjas (FU)  
2010/07/16   No talk   
Winter Semester
Date  Vn.  Title of talk  Speaker  
2009/10/16  FU  What is a Gröbner basis?  René Birkner (FU)  
2009/10/23  Ur  What is algorithmic differentiation?  Hernan Leovey (HU)  
2009/10/30  TU  What is a Facet Massacre?  Bruno Benedetti (TU)  
2009/11/06  Ur  What is a selfavoiding random walk?  Noemi Kurt (TU)  
2009/11/13  FU  What is Morse theory?  Carsten Schultz (TU)  
2009/11/20  FU  What is a Moduli space?  Nicola Tarasca (HU)  
2009/11/27  TU  What is a quantum group?  Inna Lukyanenko (TU)  
2009/12/04  Ur  What is a Seifert surface?  Silvia de Toffoli (TU)  
2009/12/11   No talk   
2009/12/18  Ur  What is a rough path?  Joscha Diehl (HU)  
2010/01/08  Ur  What is a geodesic?  Tobias Pfeiffer (FU) Dror Atariah (FU)  
2010/01/15  FU  What is a semimartingale?  Plamen Turkedjiev (HU)  
2010/01/22  Ur  What is a language game?  Hartwig Mayer (HU)  
2010/01/29  TU  What is a multigrid?  Oliver Sander (FU)  
2010/02/05  Ur  What is a graph associahedron?  Carsten Lange (FU)  
2010/02/12   No talk   
2008/09
Summer Semester
Date  Vn.  Title of talk  Speaker  
2009/04/17   No talk   
2009/04/24  Ur  What is the adaptive finite element method?  Joscha Gedicke (HU)  
2009/05/01   No talk   
2009/05/08  Ur  What is the Dedekind zeta function?  Anna Posingies (HU)  
2009/05/15  TU  What is entropy?  Yvon Vignaud (TU)  
2009/05/22  FU  What is a Goppa code?  Nathan Ilten (FU)  
2009/05/29   No talk   
2009/06/05  FU  What is a flag vector?  Axel Werner (ZIB)  
2009/06/12   No talk   
2009/06/19  Ur  What is the field with one element?  Laura Hinsch (FU)  
2009/06/26  FU  What is the square root of a graph?  Robin Scholz (U Potsdam)  
2009/07/03  FU  What is topological dynamics?  Peter Krautzberger (FU)  
2009/07/10   No talk   
2009/07/17   No talk   
Winter Semester
Date  Vn.  Title of talk  Speaker  
2008/10/17   No talk   
2008/10/24  FU  What is the random graph?  Stefanie Frick (FU)  
2008/10/31  Ur  What is homotopical algebra?  Anton Dochtermann (TU)  
2008/11/07  FU  What is deformation?  Nathan Ilten (FU)  
2008/11/14  Ur  What is an elliptic curve? Basic notions in algebraic and arithmetic geometry  Anna Pippich (HU) Fritz Hörmann (HU) 

2008/11/21  FU  What are loops and the fundamental group?  Dror Atariah (FU)  
2008/11/28  Ur  What is geometric knot theory?  Barbara Jablonska (TU)  
2008/12/05  FU  What is Hindman's theorem?  Peter Krautzberger (FU)  
2008/12/12  Ur  What is spectral expansion?  Anna Pippich (HU)  
2008/12/19  FU  What is similarity of shapes?  Daria Schymura (FU)  
2009/01/09  Ur  What is the $\mathsf{P}$ vs $\mathsf{NP}$ problem?  Matthias Lenz (TU)  
2009/01/16  FU  What is an averaging principle?  Carsten Hartmann (FU)  
2009/01/23  Ur  What is the Birch and SwinnertonDyer conjecture?  Fritz Hörmann (HU)  
2009/01/30  FU  What is a Fraisse construction?  Artem Chernikov (HU)  
2009/02/06  Ur  What is Helly's theorem?  Mareike Massow (TU)  
2009/02/13  FU  What is Brownian motion?  Plamen Turkedjiev (HU)  
2007/08
Summer Semester
The talks until 2008/07/03 were held in German.
Date  Vn.  Title of talk  Speaker  
2008/05/22  FU  Was ist eigentlich ein Ultrafilter (und was kann man damit anstellen?)  Peter Krautzberger (FU)  
2008/05/29  FU  Was ist eigentlich der RicciFluss?  Tobias Marxen (FU)  
2008/06/05  FU  Was ist eigentlich die Schälung eines Polytops?  Frederik von Heymann (FU)  
2008/06/12  FU  Was ist eigentlich eine Garbe?  Nathan Ilten (FU)  
2008/06/19  FU  Was ist eigentlich eine sinnvolle Verallgemeinerung des Zwischenwertsatz?  Felix Breuer (FU)  
2008/06/26  FU  Was ist eigentlich eine sinnvolle Erweiterung der Halbgruppe der natürlichen Zahlen?  Peter Krautzberger (FU)  
2008/07/03  FU  Was ist eigentlich das Kontinuum und was ist sein Problem?  Gido ScharfenbergerFabian (FU)  
2008/07/10   No talk   
2008/07/17  FU  What is the chromatic number of the plane?  Michael Payne (FU)  