Office contact info (phone etc) at the website of the Finnish Matriculation Examination Board where I currently work can be found in finnish and in swedish.

I used to work at the University of Helsinki in the Department of Mathematics and Statistics and did some research in the field of set theory.

## Publications

- Potential isomorphism and semi-proper trees. Joint with
Tapani Hyttinen and
Saharon Shelah.
*Fundamenta Mathematicae*, 175:127-142, 2002.- Abstract
- Preprint [dvi] [pdf] [ps] (301 in the departments report series)
- math.LO/0112288 in ArXiv
- MR1969631 (2004e:03079), Zbl 1013.03039

- Diamonds on large cardinals.
*Annales Academiae Scientiarum Fennicae Mathematica Dissertationes*, 134, 48 pp., 2003. - Orders of indescribable sets.
*Archive for Mathematical Logic*, 45:705-714, 2006.- Abstract
- Full text (manuscript) [dvi] [pdf] [ps]
- The original publication is available at www.springerlink.com
- MR2252250, Zbl 1099.03043

- Saturation of the weakly compact ideal.
*Proceedings of the American Mathematical Society*, 138: 3323-3334, 2010. - Diamond on the regulars versus weakly compact diamond. In preparation.

My PhD thesis of 2003 consists of the first two publications and a short introduction.

URL pointing to this page: *http://www.iki.fi/alex.hellsten*