Harald HancheOlsen
[Norsk/English]
 Position and contact information
 Associate professor emeritus at the Department of Mathematical Sciences.
 I no longer teach, and do not advice students
 I share an office with a handful of emeritus professors at room 1129, but you will only find me there sporadically.
 Email: harald.hancheolsen@ntnu.no.
 – See also my official home page.
 Fields of scientific interest:
 Conservation laws and nonlinear partial differential equations
 Functional analysis
 Mathematical modelling
 Stochastic analysis
 Jordan operator algebras (no activity for decades)
 Books:
 Jordan operator algebras by Harald HancheOlsen and Erling Størmer (Pitman 1984) is available as a free download.
 Proceedings volume: NonLinear Partial Differential Equations, Mathematical Physics, and Stochastic Analysis – The Helge Holden anniversary volume. Editors: Fritz Gesztesy, HHO, Espen R. Jakobsen, Yuri I. Lyubarskii, Nils Henrik Risebro, Kristian Seip (EMS 2018). I also did the copyediting and final typesetting for this book.
 Some papers:
 On the uniform convexity of L^{p} (arXiv/doi:10.1090/S0002993906083663)
 With Marte Godvik: Existence of solutions for the Aw–Rascle traffic flow model with vacuum (preprint/doi:10.1142/S0219891608001428).
 With Marte Godvik: Carfollowing and the macroscopic Aw–Rascle traffic flow model (preprint/doi:10.3934/dcdsb.2010.13.279).
 On Goursat's proof of Cauchy's integral theorem

With Helge Holden: The Kolmogorov–Riesz compactness theorem (arXiv/doi:10.1016/j.exmath.2010.03.001)
– Addendum to the above (arXiv/doi:10.1016/j.exmath.2015.12.003)  With Helge Holden and Eugenia Malinnikova: An improvement of the KolmogorovRiesz compactness theorem (arXiv)
 With Martin Grötschel, Helge Holden and Michael P. Krystek: On angular measures in axiomatic Euclidean planar geometry (arXiv:2011.05779). This preprint is an opinion piece regarding the rôle of angular measure in SI, and thus perhaps of limited interest to mathematicians. It does, however, contain a concise summary of basic axiomatic geometry, in a modern form.