Herbert Edelsbrunner and Uli Wagner
On Zoom for the duration of the Corona crisis.

Please contact Mathijs Wintraecken if you want to be notified about upcoming talks or if you want access to recordings of previous talks (assuming the speaker gave permission).

Upcoming talks:

The next two weeks we will have a two part introduction to various mathematical aspects of crystallography. The schedule is as follows:
– April 14 Uwe Grimm (open University UK)
– April 21 Michael Baake (Bielefeld)

Title: Aperiodic Order – Tilings, Projection Method, Spectra:
Part I & Part II

We introduce and discuss aperiodic tilings and points sets, with
special focus on their spectral properties and long-range order.

Part I (by Uwe Grimm) provides a general introduction to inflation
systems and their description via the cut and project method, as well
as the diffraction spectra of regular model sets.

Part II (by Michael Baake) summarises the equivalence of diffraction
and dynamical spectra, and discusses applications to planar structures
and weak model sets, particularly some of number-theoretic origin.


Speaker:  Álvaro Torras Casas (Cardiff)

Title: TBA

Abstract: TBA

Time: 19th of May at 13:00 (Vienna time), on zoom.

If you want to give a talk please contact Mathijs Wintraecken

Past talks:

31st of March 2021Dominique Attali (Gipsa-lab Grenoble)Reconstructing manifolds by weighted $\ell_1$-norm minimization
24th of March 2021Alexey Garber (Texas and a long term visitor of the Edelsbrunner group)Regularity radius for Delone sets
24th of February continued on the 3rd of March 2021Alexey Garber (Texas and long term visitor)Convex polytopes that tile space with translations: lattices and
Voronoi domains.
February 10th, 2021, 13:00 (Vienna time), on Zoom.Nicolò Zava (University of Udine)Quasi-metric: a distance notion in non-symmetric environments
January 27th, 2021, 16:00 (Vienna time)Pablo Soberón (Baruch College, City University of New York)The topological Tverberg theorem beyond prime powers
13th of January 2021, 16:00 Vienna timeErin Chambers (St. Louis) Quantifying Shape Using the Medial Axis
December 16, 2020Alexey Balitskiy (MIT)Urysohn width bounds
October 28, 2020Günter Rote (FU Berlin)Random polytopes and the wet part for arbitrary probability distributions

11th October 2020 Hana KourimskaDiscussion session
October 21, 2020George Francis (Illinois)Interactive Animations of Classical Homotopies
Wednesday, June 17, 2020Ziga VirkDetecting geodesic circles with persistent homology
June 10 and 17, 2020Hana KourimskaDiscrete Riemann surfaces and beyond
April 1, 2020Mathijs Wintraecken Topological integral invariants
Thursday, March 5, 2020Emo WelzlSylvester's Four-Point Problem on Order Types
Wednesday, March 4, 2020Amir JafariChromatic number of Kneser hypergraphs and a conjecture of Frick
Wednesday, February 12, 2020Farid KARIMIPOURTopological Data Analyis for Geospatial Data
11th of February, 2020 14:00 André LieutierLexicographic optimal chains and manifoldtriangulations
Wednesday, February 5, 2020Grisha Ivanov No-dimension versions of Caratheodory's and Tverberg's
theorems in Banach spaces and their corollaries.
Wednesday, January 22, 2020Katharina ÖlsböckThe Hole System of Triangulated Shapes
Thursday, December 5, 2019Adam BrownPersistent Microlocal Geometry
Wednesday, December 1, 2019Voytech KaluzaColin de Verdiere parameter and representations
of graphs
Wednesday, November 20, 2019Alessandro Mella (University of Bologna)Non-Topological Persistence for Computer Vision
November 6, 2019Raphael ZentnerIrreducible SL(2,C)-representations of integer homology 3-spheres
30 October, 2019Oliver Roche-NewtonGrowth, Incidence Bounds and Affine Group Energy
18 October, 2019Ziga VirkRips Complexes as Nerves
4 September, 2019Sergey AVVAKUMOVEnvy-free division and degrees of equivariant maps.
Wednesday, August 14, 2019Amir JafariOn the Chromatic Number of Kneser Graphs and Hypergraphs and Their Variants.
August 7, 2019Moritz LangSandpile monomorphisms and scaling limits
July 31, 2019Burak BUDANURDetecting recurrences in high-dimensional flows from persistence
July 17, 2019Adam BrownProbabilistic Convergence and Stability of Random Mapper Graphs
June 19, 2019Mathijs WintraeckenTriangulating submanifolds: An elementary and quantified version of Whitney's method

May 29, 2019Csaba TothOnline Unit Clustering and Covering in Euclidean Space
May 22, 2019Micha SharirPolynomials vanishing on Cartesian products: Theory and algorithms
May 15, 2019Patrick SchniderHam-Sandwich cuts and center transversals in subspaces

Wednesday, May 8, 2019Mathijs WintraeckenTriangulating manifolds: An overview with a focus on Riemannian simplices
April 26, 2019Herbert EdelsbrunnerWhence and whither computational topology (part of workshop)
April 25, 2019 Gunnar CarlssonTopological Modelling (part of workshop)
April 24, 2019 Uli Bauer, TU MunichThe structure of persistence: an introspection (part of workshop)
Wednesday, April 17, 2019Alan Marcelo ARROYO GUEVARAWhat can geometry teach us about topological drawings of graphs?
Wednesday, April 3, 2019Roland Roth.

Interplay of Geometry and Thermodynamics in Physics and Biology
Wednesday, March 27, 2019Chris HoferApplying Persistent Homology in Machine Learning
Wednesday, March 20, 2019 Ranita Biswas Relaxed Diophantine Equations for Geometric Primitives in Integer Space
March 6, 2019 Emo Welzl Connectivity of the Flip-Graph of Triangulations
Wednesday, January 16 2019, 1:00 PM @ Mondi 3Rado FulekEliminating Crossings in Drawings of Graphs
Wednesday, November 14 2018, 1:00 PM @ Mondi 3Mehdi MakhulProbabilities of incidence between lines and a plane curve over finite fields.
Wednesday, September 12, 1:00 PM @ Mondi 3Sergey AvvakumovProbabilities of incidence between lines and a plane curve over finite fields
Thursday, August 16, 1:00 PM @ Mondi 3Domotor PalvolgyiUnlabeled compression schemes
Tuesday, August 14, 1:00 PM @ Mondi 3Zur LuriaSimple connectivity in random 2-complexes
Wednesday, May 30, 1:30 PM @ Mondi 3Georg OsangThe Multi-cover Persistence of Euclidean Balls
Wednesday, May 30, 1:00 PM @ Mondi 3Kristof HuszarOn the Treewidth of Triangulated 3-Manifolds
Wednesday, May 23, 1:00 PM @ Mondi 3Mikhail SHKOLNIKOVLimit of the sandpile group
Wednesday, April 18, 1:00 PM @ Mondi 3Jie LiangModeling cell migration and computing exact probability landscape of stochastic networks
Wednesday, April 11, 1:00 PM @ Meeting room 2nd floor Central BuildingGrzegorz MuszynskiTopological Analysis and Machine Learning for Detecting Weather Patterns in Climate Model Output
Thursday, March 22, 4:00 PM @ Meeting room 2nd floor Central BuildingKatharina ÖlsböckThe Dynamic Wrap Complex in 2D and 3D
Wednesday, March 7, 1:00 PM @ Mondi 2Sergey AvvakumovHow to turn the sphere inside out and other applications of h-principle.
TUESDAY, March 6, 2:45 PM @ Mondi 2Marian MrozekPersistence of Morse Decompositions in finite topological spaces.
MONDAY, February 5, 2:00PM @ Mondi 3Ori ParzanchevskiRandom walks on (Ramanujan) graphs and complexes
Wednesday, January 18 (Thursday), 1:00PM @ Mondi 3Alexey Glazyrin (University of Texas Rio Grande Valley)Sets with few distances
Wednesday, January 17, 1:00PM @ Mondi 3Ivan IzmestievNon-polytopal spheres and barycentric subdivisions
Wednesday, December 20, 1:00PM @ Mondi 3Teresa HeissPersistent Homology of Rips-complexes of Metric Graphs
Wednesday, December 13, 1:00PM @ Mondi 3Stephan ZhechevFrom algebra to geometry: How to represent homotopy group elements as simplicial maps.
Wednesday, December 6, 1:00PM @ Mondi 3Fedor ManinGeometrically bounded embeddings
Wednesday, September 13, 1:00PM @ Mondi 3Pawel DlotkoApplied persistent homology
Wednesday, August 23, 1:00PM @ Mondi 3Nora FranklOn equilateral sets in subspaces of l_\infty^n
Wednesday, August 16, 12:45PM @ Mondi 3Teresa HeissStreaming Algorithm for Euler Characteristic Curves of Multidimensional Images
Wednesday, July 5, 12:45PM @ Mondi 3Vojtech KaluzaMapping n grid points onto a square forces an arbitrarily large Lipschitz constant
Wednesday, June 28, 12:45PM @ Mondi 3Edgardo Roldan-PensadoOn the colourful Helly theorem
Wednesday, June 21, 12:45PM @ Mondi 3Stephan ZhechevFrom algebra to geometry: How to represent homotopy group elements as simplicial maps.
Wednesday, June 14, 12:45PM @ Mondi 3Ziga VirkIntrinsic persistence of geodesic spaces
Wednesday, June 7, 12:45PM @ Mondi 3Arseniy AkopyanWhat figures on the second floor are about.
Wednesday, April 12, 12:45PM @ Mondi 3Bruno LeviVoronoi Story: To L-infinity and beyond
Wednesday, March 29, 12:45PM @ Mondi 3Alessandro Chiancone (Know Center TU Graz)Dimensionality reduction: a chat on Sliced Inverse Regression
Wednesday, February 22, 12:45PM @ Mondi 3Arnaud de MesmayOn the complexity of optimal homotopies in two dimensions.
Wednesday, February 8, 12:45PM @ Mondi 3Mikhail SkopenkovDiscrete field theory and cochain products
Wednesday, January 25, 12:45PM @ Mondi 3Reinhold G. ErbenInteraction between bone structure and hormones
Wednesday, January 18, 12:45 am @ Mondi 3Pratyush PranavPersistent Holes in the Universe : A (hierarchical) topology of the cosmic mass distribution
Wednesday, December 14, 12:45 am @ Mondi 3Andrey BondarenkoStrongly regular graphs and Borsuk's conjecture
Monday, December 12, 11:00 am @ Mondi 3Alexander Plakhov
Invisible bodies with specular surface
Wednesday November 23, 12:45 pm @ Mondi 3Zuzana PatakovaColorful simplicial depth
Wednesday November 9, 12:45 pm @ Mondi 3Pavel PatakGeneralizing Heawood inequalities for manifolds
Wednesday October 12, 12:45 pm @ Mondi 3Fedor Petrov (Steklov Institute of Mathematics, St. Petersburg)
Combinatorics of the Lipschitz polytope
Wednesday August 25, 12:45 pm @ Mondi 3Arkadiy SkopenkovStability of intersections of paths in the plane
and the van Kampen obstruction
Thursday August 18, 13:15 pm @ Mondi 3Jeremy MasonStatistical Topology of the Grain Growth Microstructure
Wednesday August 17, 12:45 pm @ Mondi 3Roman KarasevCenter transversal theorem with improved transversal depth
August 10, 12:45 pm @ Mondi 3Moshe WhiteTypes of Tverberg partitions
Wednesday, 13 April 2016, 12:45 @ Mondi 3Alexey BalitskiyShortest closed billiard trajectories in convex bodies: Elementary techniques in non-elementary problems.
Wednesday, 24 February 2015, 12:45 @ Mondi 3Imre BaranyOn a geometric Ramsey number
Wednesday, 16 December 2015, 13:15 @ Mondi 3Peter FranekRobust satisfiability of nonlinear systems