Baldur Sigurðsson



I'm doing a PhD at CEU under the supervision of András Némethi. I'm working on normal surface singularities.


I finished a BS degree at The University of Iceland in 2008 and an MS degree at Eötvös Loránd Tudományegyetem (ELTE) in 2010.

Written content




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

arXiv The Milnor fiber of the singularity f(x,y) + zg(x,y) = 0


pdf ps workshop 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.


lattice A program for calculating invariants related to lattice cohomology. manual

Oka 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.


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