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 “”.
2023/24
Summer Semester
The MATH+ colloquia are taking place in presence — we will be having inperson talks (but most are streamed online). Feel free to approach us if you would like to give a talk!
Date  Vn.  Title of talk  Speaker  
2024/04/19  HU  What are ... holomorphic symplectic varieties?  Vasily Rogov (HU Berlin)  
2023/05/03  FU  What are... sphere packing lower and upper bounds?  Ji Hoon Chun  
2024/05/24   No talk (Euler lecture in Potsdam)   
2024/05/31  TU  tba  tba  
2024/06/14  TU  tba  tba  
2024/06/28  ZIB  tba  tba  
2024/07/05  HU  tba  tba  
2024/07/12  tba  tba  tba  
Winter Semester
Talks will be in person. Most talks, unfortunately, will not be livestreamed. Feel free to approach us if you would like to give a talk!
Date  Vn.  Title of talk  Speaker  
2023/11/03  FU  What is (integer) linear programming?  Ekin Ergen  
2023/11/17  TU  What is a lowcomplexity coloring?  Jonas Köppl  
2023/12/01  FU  What is a sofic group?  Manuel Staiger  
2023/12/15  HU  What is a Fukaya category?  Muhammed E. Guelen  
2024/01/12  TU  What is a tropical plane curve?  Kamillo Ferry  
2024/01/26  FU  What is algebraic Ktheory?  Vittorio di Fraia  
2024/02/09  TU  What is a (multitype) branching process?  Marta dai Pra  
2022/23
Summer Semester
The MATH+ colloquia are taking place in presence — 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  
2023/04/28  HU  What is an Eisenstein series?  Marco Flores (HU)  
2023/05/05   No talk (Euler lecture in Potsdam)   
2023/05/12  FU  What is important in mathematical modeling of materials?  Lukas Abel (HU)  
2023/05/26  TU  What is an interacting particle system?  Musxhu (Julian) Kern (WIAS)  
2023/06/09  FU  What is a group C*algebra?  Dr. Sanaz Pooya (U Potsdam)  
2023/07/07  FU  What is the blowup method?  Dennis Chemnitz (FU)  
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)  