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Dates

Oliver Labs: Cubic Surface Models and their Historical and Mathematical Background

In the 19th century, cubic surfaces - defined by an implicit equation of degree three in three variables - were among the first interesting examples in the development of modern algebraic geometry. A well-known result by Arthur Cayley and George Salmon is that any smooth cubic contains exactly 27 straight lines. Other prominent facts are the classification of all cubic surfaces w.r.t. their singularities by Ludwig Schläfli, and Alfred Clebsch's birational map between the plane and such surfaces where six points play an essential role. The talk will present both the historical and the mathematical background of classical hand-crafted and also recent 3d-printed cubic surface models. Some of their fascinating features such as the movement of the straight lines as the surfaces vary may very well be visualized using interactive software. In 2011 and 2014, the speaker created two versions of a complete series of more than 45 types of 3d-printed cubic surface models. Copies of these are now part of several university collections such as those at Lisbon, Strasbourg, Dresden, and Mainz, as well as at the IHP at Paris. He will bring some examples of these sculptures with him in order to illustrate facts which may better be appreciated when seeing and touching a real object.

Location: HS 001/Arnimallee 3 (Tea/coffee will be served from 16:45 in room 006/A3.)

Jan 31, 2019 | 05:15 PM

Frank Neumann: Hochschild cohomology of dg-categories and spectral sequences

Location: SR 007/008, Arnimallee 6 (Tee/coffee will be served from 15:45 in room 006/A3)

Jul 18, 2018 | 04:15 PM

Vincent Trageser: On actions of non-reductive groups with a graded unipotent radical on affine varieties

Location: SR 140, A3 (Hinterhaus)

Jul 10, 2018 | 04:15 PM

Yorck Sommerhäuser: Hopf Algebras - A short introduction

Location: HS 001/A3 (Tee/coffee will be served from 15:45 in room 006/A3).

Jul 03, 2018 | 04:15 PM

Bernd Kreussler: Means, Braids and Triangle Equations

Location: HS 001, A3 (Tea & coffee will be served from 4:45 pm in room 006, A3)

Jun 28, 2018 | 05:15 PM

Alejandra Rincón Hidalgo: Bridgeland stability conditions on the n-Kronecker quiver

Location: SR 140, A3 (HH)

Jun 05, 2018 | 04:15 PM

Hanxing Lin: Introduction to Cauchy-Pompeiu type formulas on Riemann surfaces

Location: SR 140, A3 (HH)

May 22, 2018 | 04:15 PM

Heinrich Begehr: A hierarchy of complex partial differential operators II

Location: SR 140, A3 (HH)

May 15, 2018 | 04:15 PM

Heinrich Begehr: A hierarchy of complex partial differential operators

Location: SR 140, A3 (HH)

May 08, 2018 | 04:15 PM

 Alejandra Rincón: Algebraic cycles and Roitman's theorem

Location: SR 025/026, Arnimallee 6.

Oct 15, 2014 | 04:15 PM

Matthew Spong:  Geometric Invariant Theory over the reals

Location: SR 005, Arnimallee 3

Jul 09, 2014 | 04:15 PM

Nikolai Beck and Arijit Dey: Homotopic classification of vector bundles on smooth k-schemes

Location: SR 005, Arnimallee 3

Jul 02, 2014 | 04:15 PM

Arijit Dey: Homotopic properties of the canonical torsor on the Grassmannians

Location: SR 005, Arnimallee 3

Jun 25, 2014 | 04:15 PM

Victoria Hoskins: Anodyne extensions II

Location: SR 005, Arnimallee 3

Jun 18, 2014 | 04:15 PM

Joana Cirici: Anodyne extensions

Location: SR 005, Arnimallee 3

Jun 11, 2014 | 04:15 PM

Ángel Muñoz Castañeda: Excision for Picard groups and Karoubi-Villamayor K-theory

Abstract: We continue from last week by defining K_0 and K_1-regularity of a ring and prove that a regular ring is K_0 and K_1-regular. We show that distinguished squares of schemes give rise to an exact sequence relating their Picard groups and prove that K_0-regularity implies Pic-regularity. Then we define the Karoubi-Villamayor K-theory groups of a ring and relate these to the K_0 and K_1 groups. Further details: http://userpage.fu-berlin.de/hoskins/seminar.html [userpage.fu-berlin.de]

Location: Arnimalle 3, SR005

Jun 04, 2014 | 04:15 PM

Ángel Muñoz Castañeda: K_0 and K_1 for rings

Location: SR 005, Arnimallee 3

May 28, 2014 | 04:00 PM

Nickolai Beck: The A^1-homotopy category of smooth k-schemes

Location: SR 005, Arnimallee 3

May 21, 2014 | 04:00 PM

Anna Wißdorf: The simplicial homotopy category of sheaves

Location: SR 005, Arnimallee 3

May 14, 2014 | 04:00 PM

Eva Martínez: Sheaves in the Nisnevich topology

Location: SR 005, Arnimallee 3

May 07, 2014 | 04:00 PM

Elena Martinengo: An introduction to homotopical algebra

Location: SR 005, Arnimallee 3

Apr 30, 2014 | 04:00 PM

Vincent Trageser: Classification of principal bundles in algebraic topology

Location: Arnimalle 3, SR005

Apr 23, 2014 | 04:00 PM

Victoria Hoskins: Introduction to A^1- homotopy theory of schemes

Location: SR 005, Arnimallee 3

Apr 16, 2014 | 04:15 PM

Anna Wißdorf: The theorem of Mehta-Ramanathan

Location: Arnimallee 6, SR 025/026

Feb 12, 2014 | 04:15 PM

Nikolai Beck: Wonderful compactifications

Location: Arnimallee 6, SR 025/026

Feb 05, 2014 | 04:15 PM

Anna Wißdorf: Introduction to Arakelov Geometry II: Arakelov principal bundles 

Location: Arnimallee 6, SR 025/026

Jan 22, 2014 | 04:15 PM

Eva Martínez: Introduction to Arakelov Geometry I: Arakelov vector bundles over arithmetic curves 

Location: Arnimallee 6, SR 025/026

Jan 15, 2014 | 04:15 PM

Victoria Hoskins: Towards symplectic and hyperkähler quotients for non-reductive groups 

Location: Arnimallee 6, SR 025/026

Jan 08, 2014 | 04:15 PM

Anna Wißdorf: Betti numbers of the moduli space of Higgs bundles of rank 2 and degree 1 

Location: Arnimallee 6, SR 025/026

Dec 18, 2013 | 04:15 PM

Nikolai Beck: The gauge theoretic moduli space 

Location: Arnimallee 6, SR 025/026

Dec 11, 2013 | 04:00 PM c.t.

Joana Cirici: Hitchin's Existence Theorem

Location: Arnimallee 6, SR 025/026

Dec 04, 2013 | 04:00 PM c.t.

Ángel Muñoz: Stability of Hitchin pairs 

Location: Arnimallee 6, SR 025/026

Nov 27, 2013 | 04:00 PM c.t.

Joana Cirici: Uhlenbeck’s Compactness Theorem

Location: Arnimallee 6, SR 025/026

Nov 20, 2013 | 04:00 PM c.t.

Eva Martinez: Sobolev spaces of sections in fiber bundles 

Location: Arnimallee 6, SR 025/026

Nov 13, 2013 | 04:15 PM

Vincent Trageser: Review of classical Sobolev theory 

Location: Arnimallee 6, SR 025/026

Nov 06, 2013 | 04:00 PM c.t.

Ángel Muñoz: Hitchin’s self-duality equations 

Location: Arnimallee 6, SR 025/026

Oct 30, 2013 | 04:00 PM c.t.

Arijit Dey: Bundles on toric varieties

Location: Arnimallee 6, SR 025/026

Oct 23, 2013 | 04:15 PM

Eva Martinez: Moduli spaces of stable rank 2 vector bundles on flag manifolds

Location: SR 005, Arnimallee 3

Oct 16, 2013 | 04:00 PM c.t.

Juan Pons: Donaldson’s proof of Narasimhan-Seshadri

Location: SR 005, Arnimallee 3

Jul 10, 2013 | 04:00 PM c.t.

Emilio Franco: Refined Hitchin-Kobayashi correspondence on elliptic curves 

Location: SR 005, Arnimallee 3

Jul 03, 2013

Nikolai Beck: Gauge theory of fiber bundles

Location: SR 005, Arnimallee 3

Jun 19, 2013 | 04:00 PM c.t. - 06:00 PM

Anna Wißdorf: The Theorem of Narasimhan and Seshadri

Location: SR 005, Arnimallee 3

Jun 12, 2013 | 04:00 PM c.t. - 06:00 PM

Joana Cirici: Computing the E-polynomial of character varieties

Location: SR 005, Arnimallee 3

Jun 05, 2013 | 04:00 PM c.t. - 06:00 PM

Juan Pons: Counting points of character varieties over finite fields. 

Location: SR 005, Arnimallee 3

May 29, 2013 | 04:00 PM c.t. - 06:00 PM

Daniela Prata (Campinas, Brazil)

Location: SR 005, Arnimallee 3

May 24, 2013 | 11:00 AM - 01:00 PM

Simone Marchesi (Campinas Brazil)

Location: SR 130, Arnimallee 3, Hinterhaus

May 23, 2013 | 11:00 AM - 01:00 PM

Ángel Muñoz: Abelianization of the Hitchin system

Location: SR 005, Arnimallee 3

May 15, 2013 | 04:00 PM c.t. - 06:00 PM

Anna Wißdorf: Construction of the Harder-Narasimhan reduction

Location: SR 005, Arnimallee 3

May 08, 2013 | 04:00 PM c.t. - 06:00 PM

Anna Wißdorf: The Harder–Narasimhan reduction of a Higgs bundle.

Location: SR 005, Arnimallee 3

Apr 24, 2013 | 04:00 PM c.t. - 06:00 PM

Nickolai Beck: The moduli space of Higgs bundles.

Location: SR 005, Arnimallee 3

Apr 17, 2013 | 04:00 PM c.t. - 06:00 PM

Anna Wißdorf: Symplectic and Orthogonal Instantons

Location: SR 025/026, Arnimallee 6

Feb 06, 2013 | 04:00 PM c.t. - 06:00 PM

Nikolai Beck: Explicit Examples of Instanton Moduli Spaces II

Location: SR 025/026, Arnimallee 6

Jan 23, 2013 | 04:00 PM c.t. - 06:00 PM

Nikolai Beck: Explicit Examples of Instanton Moduli Spaces

Location: Arnimallee 6, SR 025/026

Jan 09, 2013 | 04:00 PM c.t. - 06:00 PM

Joanna Cirici: The Penrose Transform III : Cohomology and massless fields

Location: SR 025/026, Arnimallee 6

Dec 19, 2012 | 04:00 PM c.t. - 06:00 PM

Patricia Borges dos Santos: Complex ADHM equations and sheaves on P^3

Location: Arnimallee 6, SR 025/026

Dec 05, 2012 | 04:15 PM - 06:00 PM

Elena Martinengo: The Penrose Transformation

Location: Arnimallee 6, SR 025/026

Nov 28, 2012 | 04:15 PM - 06:00 PM

Juan Pons Llopis: From Differential to Algebraic Geometry: Penrose Twistor Spaces

Location: Arnimallee 6, SR 025/026.

Nov 21, 2012 | 04:00 PM c.t. - 06:00 PM

E.F.Gomez: Yang-Mills Equations and the Instanton Classification Problem

Location: Arnimallee 6, SR 025/026

Nov 14, 2012 | 04:00 PM - 04:45 PM

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