1 citations · 1 across the 5 of their papers we have counts for
6 papers
On Shnirelman's inequality in 2D: Irreversible behavior and Euler-Lagrange variational formulation
Stefan Schiffer, Martina Zizza
In this paper we prove a version of Shnirelman's inequality in the two-dimensional square . More precisely, given a target fluid configuration (a volume-preserving dif…
Higher integrability of solutions to elliptic equations under additional sign constraints
Stefan Schiffer
Solutions to elliptic equations often exhibit higher regularity properties such as \emph{higher integrability}. That is, for instance, a solution to a system that a priori only…
Insights from Interviews with Teachers and Students on the Use of a Social Robot in Computer Science Class in Sixth Grade
Ann-Sophie L. Schenk, Stefan Schiffer, Heqiu Song
In this paper we report on first insights from interviews with teachers and students on using social robots in computer science class in sixth grade. Our focus is on learning about…
On incompressible flows in discrete networks and Shnirelman's inequality
Stefan Schiffer, Martina Zizza
Let and be two volume-preserving diffeomorphisms on the cube , . We show that there is a divergence-free vector field such tha…
-free truncation and higher integrability of minimisers
Stefan Schiffer
We show higher integrability of minimisers of functionals \[ I(u) = \int_Ω f(x,u(x)) ~\mathrm{d}x \] subject to a differential constraint under natural -growth…
Extensions of divergence-free fields in -based function spaces
Franz Gmeineder, Stefan Schiffer
We establish the first extension results for divergence-free (or solenoidal) elements of -based function spaces. Here, the key point is to preserve the solenoidalit…