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Viser treff 1-48 av 48

2019
1 Christophersen, Jan Arthur; Kleppe, Jan Oddvar.
Comparison theorems for deformation functors via invariant theory. Collectanea Mathematica 2019 ;Volum 70.(1) s. 1-32
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2018
2 Christophersen, Jan Arthur.
Cotangent cohomology for Pflücker algebras. Seminar Algebraische Geometri, Freie Unvivärsitet, Berlin; 2018-11-15 - 2018-11-15
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3 Christophersen, Jan Arthur; Ranestad, Kristian.
Geometry of Moduli. Abelsymposium 2017. Springer 2018 (ISBN 978-3-319-94880-5) 326 s. Abel Symposia(14)
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2017
4 Christophersen, Jan Arthur; Ilten, Nathan Owen.
Vanishing cotangent cohomology for Plücker algebras. Communications in Algebra 2017 ;Volum 45.(9) s. 3929-3947
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2016
5 Christophersen, Jan Arthur.
Derivations of artinian algebras and rigidity of curve singularities. Seminar Algebraische Geometrie, Freie Unvivärsitet, Berlin; 2016-11-21 - 2016-11-21
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6 Christophersen, Jan Arthur; Ilten, Nathan Owen.
Hilbert schemes and toric degenerations for low degree Fano threefolds. Journal für die Reine und Angewandte Mathematik 2016 ;Volum 2016.(717) s. 77-100
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2014
7 Christophersen, Jan Arthur.
Local cohomology and higher cotangent cohomology for cones over Grassmannians. FU Berlin. Seminar Algebraische Geometrie, FU Berlin; 2014-06-30 - 2014-06-30
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8 Christophersen, Jan Arthur.
Local cohomology of the Kähler differentials of invariant rings. Seminar Algebraische Geometrie, Freie Univärsitet Berlin; 2014-11-10 - 2014-11-10
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9 Christophersen, Jan Arthur; Ilten, Nathan Owen.
Degenerations to unobstructed Fano Stanley-Reisner schemes. Mathematische Zeitschrift 2014 ;Volum 278.(1-2) s. 131-148
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2013
10 Christophersen, Jan Arthur.
Comparison theorems for deformation functors. Mini workshop in algebraic geometry - FU Berlin; 2013-03-25 - 2013-03-26
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11 Christophersen, Jan Arthur.
Simplicial complexes and projective varieties. Séminaire d'algèbre, topologie et géométrie, Univ Nice; 2013-01-24 - 2013-01-24
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2012
12 Christophersen, Jan Arthur.
Comparison theorems for deformation functors. Oberwolfach conference - Singularities; 2012-09-23 - 2012-12-29
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13 Christophersen, Jan Arthur.
Simplicial complexes and projective varieties. Topology and Geometry Seminar, Imperial College London; 2012-05-25 - 2012-05-25
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14 Christophersen, Jan Arthur.
Triangulated topological manifolds and special algebraic varieties. Pure Mathematics Seminar, University of Western Australia; 2012-03-28 - 2012-03-28
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2011
15 Christophersen, Jan Arthur.
Associahedra, deltahedra and Mukai varieties. Seminar Algebraische Geometrie - FU Berlin; 2011-10-17 - 2011-10-17
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16 Christophersen, Jan Arthur.
Deformations of equivelar Stanley-Reisner abelian surfaces. Advances in Mathematics 2011 ;Volum 227.(2) s. 801-829
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17 Christophersen, Jan Arthur.
On the Hilbert scheme containing Fano threefolds of low degree. Extremal Laurent polynomials and Fano varieties - Berlin; 2011-12-14 - 2011-12-16
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18 Christophersen, Jan Arthur.
The associahedron, deltahedra and Stanley-Reisner Fano varieties. Oberseminar Algebraische-Geometrie Kaiserslautern/Saarbrücken; 2011-05-26 - 2011-05-26
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19 Christophersen, Jan Arthur.
Triangulated topological manifolds and special algebraic varieties. Matematische Kolloquium Universität des Saarlandes; 2011-05-27 - 2011-05-27
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2010
20 Altmann, Klaus; Christophersen, Jan Arthur.
Deforming Stanley-Reisner schemes. Mathematische Annalen 2010 ;Volum 348.(3) s. 513-537
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21 Christophersen, Jan Arthur.
Deformasjoner av monomiale idealer. Nasjonalt algebramøte 2010; 2010-11-11 - 2010-11-12
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22 Christophersen, Jan Arthur.
Deformation Theory. S2AM Summer School for Algorithmic Mathematics, Berlin; 2010-08-16 - 2010-08-20
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23 Christophersen, Jan Arthur.
Deformations of monomial ideals. Forschungsseminar "Algebraische Geometrie", FU Berlin; 2010-11-22 - 2010-11-22
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24 Christophersen, Jan Arthur.
Deformations of Stanley-Reisner abelian surfaces. Séminaire sur les singularités, Institut Mathématique de Jussieu; 2010-02-08 - 2010-02-08
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25 Christophersen, Jan Arthur.
Forelesningsnotater MAT2500. : Ingen 2010 30 s.
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2009
26 Christophersen, Jan Arthur.
Ekvivelære trianguleringer av torusen og abelske flater. Nasjonalt algebramøte; 2009-11-12 - 2009-11-13
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27 Christophersen, Jan Arthur.
Equivelar triangulations of tori and abelian surfaces. SFB-Seminar, Berlin; 2009-01-13 - 2009-01-13
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28 Christophersen, Jan Arthur.
Introductory course in Deformation Theory. Workshop on Deformation Theory in Algebraic Geometry, Mainz; 2009-02-16 - 2009-02-20
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29 Christophersen, Jan Arthur.
Milnor fibers of cyclic quotient singularities. Forschungsseminar "Algebraische Geometrie" FU Berlin; 2009-11-30 - 2009-11-30
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2008
30 Christophersen, Jan Arthur.
Deformations of Stanley-Reisner surfaces. Deformations of Surfaces, Budapest; 2008-10-10 - 2008-10-12
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31 Christophersen, Jan Arthur.
The minimal triangulation of the torus and abelian surfaces. Graduiertenkolleg "Methods for Discrete Structures", Berlin; 2008-05-05 - 2008-05-05
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32 Christophersen, Jan Arthur.
Triangulations of the Torus and Abelian Surfaces. Mathematisches Kolloquium; 2008-10-30 - 2008-10-30
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2007
33 Christophersen, Jan Arthur.
Deformation theory in algebraic geometry. Workshop on deformation theory in algebraic and differential geometry; 2007-12-13 - 2007-12-18
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34 Christophersen, Jan Arthur.
Deformations of a Stanley-Reisner abelian surface. Seminari di Geometria; 2007-12-06 - 2007-12-06
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2006
35 Christophersen, Jan Arthur.
Deformation theory, cotangent complexes and Massey products. Seminar Algebraische Geometrie, FU Berlin; 2006-07-21 - 2006-07-21
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36 Christophersen, Jan Arthur.
Deformations of a degenerate abelian surface in P^6. INTERNATIONAL RESEARCH TRAINING GROUP ARITHMETIC AND GEOMETRY; 2006-06-20 - 2006-06-20
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37 Christophersen, Jan Arthur.
Deformations of a degenerate abelian surface in P6. Oberseminar Algebraische Geometrie; 2006-07-05 - 2006-07-05
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38 Christophersen, Jan Arthur.
Deformations of a Stanley-Reisner abelian surface and a Calabi-Yau 3-fold with Euler number 6. Singularities, Oberwolfach; 2006-09-11 - 2006-09-15
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2004
39 Altmann, Klaus; Christophersen, Jan Arthur.
Cotangent cohomology of Stanley-Reisner rings. Manuscripta mathematica 2004 ;Volum 115. s. 361-378
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2001
40 Christophersen, Jan Arthur; Gustavsen, Trond Stølen.
On infinitesimal deformations and obstructions for rational surface singularities. Journal of Algebraic Geometry 2001 ;Volum 10.(1) s. 179-198
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2000
41 Christophersen, Jan Arthur.
Deforming Stanley-Reisner rings. New Developments in Singularity Theory; 2000-01-01
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42 Christophersen, Jan Arthur.
Symmetri og materiens struktur - fra antikken til kvantefysikken. ; 2000
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1994
43 Behnke, Kurt; Christophersen, Jan Arthur.
M-resolutions and deformations of quotient singularities. American Journal of Mathematics 1994 ;Volum 116. s. 881-903
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1993
44 Behnke, Kurt; Christophersen, Jan Arthur.
Hypersurface sections and obstructions (minimal elliptic singularities). Transactions of the American Mathematical Society 1993 ;Volum 335. s. 175-193
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1991
45 Behnke, Kurt; Christophersen, Jan Arthur.
Hypersurface sections and obstructions (rational surface singularities). Compositio Mathematica 1991 ;Volum 77. s. 233-268
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46 Christophersen, Jan Arthur.
On the components and discriminant of the versal base space of cyclic quotient singularities. I: Singularity Theory and its Applications, Warwick 1989 Part 1. Springer 1991 s. 81-92
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1990
47 Christophersen, Jan Arthur.
Obstructions for rational singularities and deformations of cyclic quotients. Universitetet i Oslo 1990 -1 s.
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1987
48 Christophersen, Jan Arthur.
Monomial curves and obstructions on cyclic quotient singularities. I: Singularities, Representation of Algebras, and Vector Bundles, Proc., Lambrecht 1985. Springer 1987 s. 117-133
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