Johan Commelin

I am a PhD student under supervision of Ben Moonen. My main interest lies in algebraic geometry and algebraic number theory. I am funded by NWO project 613.001.207 (Arithmetic and motivic aspects of the Kuga–Satake construction).

Current research topics include: Hodge theory, reductive groups and their representations, p-adic Hodge theory, Galois representations, motives.

Contact details

@: j.commelin (funny symbol)
P: +31 (0)24 365 2865
A: HG 03.724
Huygens Gebouw
Heyendaalseweg 135
6525 AJ Nijmegen


Seminars that I organised (or co-organised).
Local Langlands Microsymposium (with Milan Lopuhaä)27 January 2015
Local Langlands Seminar (with Milan Lopuhaä)Autumn 2014
PhD Colloquium (with Rutger Kuyper)Spring 2014 – now
Basic Notions Reading GroupAutumn 2013


As teaching assistant in Nijmegen:

Calculus 3&4Spring 2015
Abelian VarietiesAutumn 2014
Rings and FieldsSpring 2014

As teaching assistant in Leiden:

Algebra 1Spring 2013
Algebra 3Spring 2013
Seminar on Commutative AlgebraSpring 2012
Algebra 1Spring 2012
Projective GeometrySpring 2012
Analysis 3 (physics)Autumn 2011


11 Dec 2014
Local Langlands seminar — Weil–Deligne representations. Notes
13 Nov 2014
Local Langlands seminar — Functional equation for GL2 and cuspidal local constants. Notes
23 Oct 2014
Abelian Varieties — Finite group schemes. Notes
3 Mar 2014
PhD colloquium (RU) — What is a motive? Notes
3 Dec 2013
Seminar on Étale Cohomology — Étale cohomology of fields. Notes
16 Jul 2013
Master's thesis defense — Algebraic cycles, Chow motives, and L-functions
18 Mar 2013
Topics in Algebraic Geometry — Good reduction. Notes
11 Feb 2013
Topics in Algebraic Geometry — Projective and noetherian schemes.
26 Apr 2012
Commutative Algebra seminar — Derivations and Differentials. Notes
26 Mar 2012
Topics in Algebraic Geometry — The structure of [N] II. Notes
19 Mar 2012
Topics in Algebraic Geometry — The structure of [N] I. Notes


I wrote my master's thesis, titled Algebraic cycles, Chow motives, and L-functions, in the spring of 2013 under the supervision of Robin de Jong.

I wrote my bachelor's thesis, titled Tannaka Duality for Finite Groups, in the spring of 2011 under the supervision of Lenny Taelman.

Side projects