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math.AP2020★ 6 cited
Well-posed variational formulations of Friedrichs-type systems
Martin Berggren, Linus Hägg
All finite element methods, as well as much of the Hilbert-space theory for partial differential equations, rely on variational formulations, that is, problems of the type: find $u…
math.AP2019
On the well-posedness of Galbrun's equation
Linus Hägg, Martin Berggren
Galbrun's equation, which is a second order partial differential equation describing the evolution of a so-called Lagrangian displacement vector field, can be used to study acousti…