Mats Ehrnstrom

Professor Department of Mathematical Sciences
+47 73591744
Alfred Getz vei 1, Sentralbygg II * 1146

Background and activities

Nonlinear partial differential equations

Elliptic equations; primarily stationary free-boundary flows. I have also done some work on ordinary differential, integro-differential and difference equations.

Fluid mechanics

Of particular interest are travelling water waves, free-surface flows and rotational currents. Current foci are waves with critical layers, multimodal waves and Whitham-like equations.

Current research group

Gabriele Brüll (Postdoc), Yuexun Wang (Postdoc); Long Pei (PhD), Mathias Nikolai Arnesen (PhD), Kristoffer Varholm (PhD), Filippo Remonato (PhD), Fredrik Hildrum (PhD).

Current projects and programmes

CV available for download above.


  • M. Ehrnström, M. A. Johnson and K. M. Claassen. Existence of a highest wave in a fully dispersive two-way shallow water model.  arXiv:1610.02603
  • M. Ehrnström and E. Wahlén. On Whitham's conjecture of a highest cusped wave for a nonlocal shallow water wave equation. arXiv:1602.05384
  • G. Bruell, M. Ehrnström and L. Pei. Symmetry and decay of traveling wave solutions to the Whitham equation. J. Differential Equations, 262(8): pp 4232–4254 (2017). arXiv:1608.07944

Scientific, academic and artistic work

Displaying a selection of activities. See all publications in the database

Journal publications