Ph.D., yliopistonlehtori / University Lecturer

Jarmo Jääskeläinen
October 7, 2025
Department of Economics and Management, University of Helsinki Room 313 (Viikki Campus, Koetilantie 5) jarmo.jaaskelainen@helsinki.fi Other sites: Helsinki.fi, Research portal
Interests

I am an expert on partial differential equations and the calculus of variations. I am interested in using the optimal control theory, dynamical optimisation methods and other mathematical tools in environmental and resource economics. I teach mathematics for economists.

Jarmo Jääskeläinen
Figure 1: Portrait of the author.
Proposition 1. (Kelly Link: The Girl Detective)

There are three kinds of food. One is the food that your mother makes for you. One is the kind of food that you eat in restaurants. One is the kind of food that you eat in dreams.

Publications

Papers & Preprints

  1. Restoring the Commons: Optimizing the Restoration of Natural Assets (with Pauli Lappi), Economic Theory (2025), doi:10.1016/j.jfa.2024.110721, postprint (pdf)
  2. Homeomorphic Sobolev extensions of parametrizations of Jordan curves (with Ondrěj Bouchala, Pekka Koskela, Haiqing Xu and Xilin Zhou), Journal of Functional Analysis (2025) 288 (4), doi:10.1016/j.jfa.2024.110721, preprint in arXiv:2408.00506
  3. Improved Hölder regularity for strongly elliptic PDEs (with Kari Astala, Albert Clop, Daniel Faraco and Aleksis Koski), Journal de Mathématiques Pures et Appliquées (2020) 140: 230–258, doi:10.1016/j.matpur.2020.06.005, preprint in arXiv:1906.10906
  4. The Radó-Kneser-Choquet theorem for p-harmonic mappings between Riemannian surfaces (with Tomasz Adamowicz and Aleksis Koski), Revista Matemática Iberoamericana (2020) 36 (6): 1779–1834, doi:10.4171/rmi/1183, postprint in JYX, preprint in arXiv:1806.03020
  5. Nonlinear Beltrami operators, Schauder estimates and bounds for the Jacobian (with Kari Astala, Albert Clop, Daniel Faraco and Aleksis Koski), Annales de l'Institut Henri Poincaré (C) Analyse Non Linéaire (2017) 34 (6): 1543–1559, doi:10.1016/j.anihpc.2016.10.008, preprint in arXiv:1511.08370
  6. Manifolds of quasiconformal mappings and the nonlinear Beltrami equation (with Kari Astala, Albert Clop and Daniel Faraco), Journal d'Analyse Mathematique (2019) 139 (1): 207–238, doi:10.1007/s11854-019-0059-x, postprint in JYX, preprint in arXiv:1412.4046
  7. Uniqueness of Normalized Homeomorphic Solutions to Nonlinear Beltrami Equations (with Kari Astala, Albert Clop, Daniel Faraco and László Székelyhidi Jr.), International Mathematics Research Notices IMRN (2012) 2012 (18): 4101–4119, doi:10.1093/imrn/rnr178, preprint in arXiv:1012.2827
  8. On reduced Beltrami equations and linear families of quasiregular mappings, Journal für die reine und angewandte Mathematik (Crelles Journal) (2013) 682: 49–64, doi:10.1515/crelle-2012-0041, preprint in arXiv:1009.2614
  9. Homeomorphic solutions to reduced Beltrami equations (with Kari Astala), Annales Academiæ Scientiarum Fennicæ Mathematica (2009) 34: 607–613, preprint in arXiv:0812.2322

Dissertation

  1. On Linear and Nonlinear Beltrami Systems, Ph.D. dissertation, University of Helsinki, collecting papers 1.–3.    [handout slides of Lectio praecursoria]

Own Projects

I have been funded by Academy of Finland (nowadays Research Council of Finland) projects no. 276233 and 318636: Nonlinear Elliptic Equations, Quasiharmonic Fields, and the Range of the Differential at the University of Helsinki 01.09.2014–31.08.2017 and at the University of Jyväskylä 01.09.2017–28.02.2018.

Prizes

Vuoden opetusteko 2024

Teaching

  1. RATKOMO, University of Helsinki, 2022-2025
  2. Talousmatematiikka, University of Helsinki, Spring 2026
  3. Mathematics for economists IV, University of Helsinki, Autumn 2025
  4. Matematiikka 1 ja 2, University of Helsinki, Autumn 2025
  1. Talousmatematiikka, University of Helsinki, Spring 2025
  2. Matematiikka 1, 2 ja 3, University of Helsinki, Autumn 2024
  3. Talousmatematiikka, University of Helsinki, Spring 2024
  4. Matematiikka 1, 2 ja 3, University of Helsinki, Autumn 2023
  5. Matematiikkaa taloustieteilijöille I ja II, University of Helsinki, Autumn 2022
  6. Calculus 1 - verkko-opetus, University of Jyväskylä, Spring 2022
  7. Calculus 3, University of Jyväskylä, Spring 2022
  8. Calculus 2, University of Jyväskylä, Autumn 2021
  9. Calculus 1, University of Jyväskylä, Autumn 2021
  10. Johdatus matemaattiseen analyysiin 4, University of Jyväskylä, Spring 2021
  11. Johdatus matemaattiseen analyysiin 1, University of Jyväskylä, Autumn 2020
  12. Logiikka, University of Jyväskylä, Summer 2020
  13. Kompleksilaskenta, University of Jyväskylä, Summer 2019
  14. Johdatus matemaattiseen analyysiin 2, University of Jyväskylä, Autumn 2018
  15. Johdatus matemaattiseen analyysiin 4, University of Jyväskylä, Spring 2018
  16. Differentiaaliyhtälöt II, University of Helsinki, Spring 2017
  17. Differentiaaliyhtälöt I, University of Helsinki, Spring 2017

Talks & Presentations

[show]

Department of Economics and Management, Koetilantie 5, P.O. Box 28, 00014 University of Helsinki, Finland

Valid XHTML 1.0, CSS

portrait taken by Janne Artell

Lora is a serif font family · Black · White · Deep Pink · Dark Gray · Gray · Almost Invisible Light Gray