Prof. Dr. Nicolas Perrin

Former Bonn Junior Fellow
Current position: Professor, Versailles Saint-Quentin-en-Yvelines University

E-mail: nicolas.perrin(at)
Institute: Mathematical Institute

Academic Career


PhD, Versailles University, France

2001 - 2002

Postdoc, University of Cologne

2002 -

Maître de conférences, University of Paris VI, France

2007 -

Professor (W2, Bonn Junior Fellow), University of Bonn


Habilitation, University of Paris VI, France

Research Profile

I work at the intersection of representation theory and algebraic geometry. I have been working on the singularities of Schubert varieties and the existence of small resolutions which allow to compute Kahzdan-Luzstig polynomials. I have also been working on enumerative geometry of homogeneous spaces and especially quantum cohomology. On this subject I computed the quantum cohomology of new varieties and discovered some unexpected symmetries.
I have also been interested in the geometry of low codimension subvarieties in homogeneous spaces (see [1] and [2]).

Research Projects and Activities

ANR (French National Research Agency) project: “New Symmetries in Gromov-Witten Theory”

Selected Publications

[1] Nicolas Perrin
Small codimension smooth subvarieties in even-dimensional homogeneous spaces with Picard group \Bbb Z
C. R. Math. Acad. Sci. Paris , 345: (3): 155--160
DOI: 10.1016/j.crma.2007.06.012

Publication List

MathSciNet Publication List (external link)

Selected Invited Lectures


Schubert calculus and Schubert geometry, Banff, AB, Canada


Combinatorial, Enumerative and Toric geometry, Mathematical Sciences Research Institute (MSRI), Berkeley, CA, USA


Romanian-German symposium on moduli spaces in Geometry and Physics, Sibiu (Hermannstadt), Romania


Algebraic Groups, Oberwolfach, Germany


Classical Algebraic Geometry, Oberwolfach, Germany


Complex Algebraic Geometry, Paris, France


Complex Geometry, Vector bundles, Algebraic varieties with a group action, Algebraic Cycles, Hyderabad, India

Selected PhD students

Piotr Achinger (2015): “K(pi, 1) Spaces in Algebraic Geometry”,
now EPDI Postdoc, Banach Center, Warsaw, Poland
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