Baldur Sigurðsson




I have recently finished a PhD at CEU under the supervision of András Némethi. I'm working on normal surface singularities as part of the low dimensional topology team at the Alfréd Rényi Institute of Mathematics.


I finished a BS degree at The University of Iceland () in 2008, an MS degree at Eötvös Loránd Tudományegyetem (ELTE) in 2010 and a PhD at Central European University (CEU) in 2015.

Written content


pdf The geometric genus and the Seiberg-Witten invariant of Newton nondegenerate surface singularities.

pdf Slides presented during the defense.


pdf Curriculum vitae.


arXiv pdf The geometric genus of hypersurface singularities. Joint with András Némethi. Accepted for publication in The Journal of the European Mathematical Society.

arXiv pdf Peer reviewed journal publication The Milnor fiber of the singularity f(x,y) + zg(x,y) = 0.


pdf The geometric genus of hypersurfaces, presented on the 13th International Workshop on Real and Complex Singularities Celebrating the 60th birthday of MarĂ­a del Carmen Romero Fuster July 27th - August 1st 2014.


C man A program for calculating invariants related to lattice cohomology.

GP A collection of functions related to numerical invariants of surface singularities written in PARI/GP. Includes an implementation of Oka's algorithm. Be warned that the function that calculates the Turaev torsion is flaky. I'll have to redo that whole thing, but until then, don't take it as absolute truth. In particular, the Seiberg-Witten invariant may be incorrect.

html A collection of small projects.


html Here are some notes on various issues. I'm mostly collecting them here for myself, but maybe they are of help to others.