2 citations · 4 across the 7 of their papers we have counts for
7 papers
On the complex constant rank condition and inequalities for differential operators
Stefan Schiffer
In this note, we study the complex constant rank condition for differential operators and its implications for coercive differential inequalities. These are inequalities of the for…
An alternative approach to solenoidal Lipschitz truncation
Stefan Schiffer
In this work, a new approach to obtain a solenoidal Lipschitz truncation is presented. More precisely, the goal of the truncation is to modify a function $u \in W^{1,p}(\mathbb{R}^…
A data-driven approach to viscous fluid mechanics -- the stationary case
Christina Lienstromberg, Stefan Schiffer, Richard Schubert
We introduce a data-driven approach to the modelling and analysis of viscous fluid mechanics. Instead of including constitutive laws for the fluid's viscosity in the mathematical m…
Natural annihilators and operators of constant rank over
Franz Gmeineder, Stefan Schiffer
Even if the Fourier symbols of two constant rank differential operators have the same nullspace for each non-trivial phase space variable, the nullspaces of those differential oper…
A sufficient and necessary condition for -quasiaffinity
Stefan Schiffer
We consider a homogeneous, constant rank differential operator and prove a characterisation theorem for -quasiaffine functions in the spirit of Ball, Cur…
On symmetric div-quasiconvex hulls and divsym-free -truncations
Linus Behn, Franz Gmeineder, Stefan Schiffer
We establish that for any non-empty, compact set the - and -symmetric div-quasiconvex hulls and …
-truncation of closed differential forms
Stefan Schiffer
In this paper, we prove that for each closed differential form , which is almost in $L^{\inft…