About me

I am a Ph.D. candidate under supervision of Gil Cavalcanti and am part of the Geometric Structures group at Utrecht University, led by Marius Crainic. I obtained my master's degree in mathematics from Utrecht University, and hold bachelor's degrees in applied physics and applied mathematics from Eindhoven University of Technology.

My CV can be found here.

Links to: arXiv preprints, and Google scholar.

Research interests

My research interests are in the fields of Poisson geometry and generalized complex geometry. Moreover, I am interested in surrounding areas such as symplectic geometry, gauge theory, Dirac geometry, index theory, and low-dimensional topology. My main interest lies in using Lie algebroids to apply and extend symplectic techniques to Poisson and generalized complex structures.

Preprints and publications


In preparation:

  • Homotopical obstructions for A-symplectic structures.
  • Dirac and Poisson geometry on ideal Lie algebroids.
  • Cosymplectic fillings and log-symplectic structures.
  • Splitting theorems for A-Poisson structures. (with Melinda Lanius)
  • Rigged algebroids and A-Poisson structures. (with Melinda Lanius)


  • Seiberg-Witten theory for symplectic manifolds. (Master thesis)
  • Geometric structures and Lie algebroids. (Ph.D. thesis, in preparation)

Teaching and seminars

Courses at Utrecht University:
  • Wat is Wiskunde? WISB101 (Fall 2015). Osiris.
  • Differentiaalvergelijkingen WISB231 (Spring 2016). Osiris. Webpage.
  • Wat is Wiskunde? WISB101 (Fall 2016). Osiris.


  • Donaldson theory (Fall 2012).
  • Four-manifolds and Kirby calculus (Spring 2014). Outline.
  • Classification of compact complex surfaces (Fall 2014 - Spring 2015). Schedule.
  • Seiberg-Witten and Gromov invariants for symplectic 4-manifolds (Fall 2015). Schedule.
  • Existence and classification of overtwisted contact structures in all dimensions (2015).
  • Mathematical aspects of quantum field theory (2014 - 2016). Webpage.


Utrecht University
Mathematical Institute
Budapestlaan 6
3584 CD Utrecht
The Netherlands

Office 603 
Email: r.l.klaasse 'at'
            r.l.klaasse 'at'
Phone: +31 30 253 3045