Abstract
AbstractWe consider a homogeneous differential operator $${\mathcal {A}}$$
A
and show an improved version of Murat’s condition for $${\mathcal {A}}$$
A
-quasiaffine functions, provided that the operator $${\mathcal {A}}$$
A
satisfies the constant rank condition. As a consequence, we obtain that affinity along the characteristic cone of $${\mathcal {A}}$$
A
implies $${\mathcal {A}}$$
A
-quasiaffinity if $${\mathcal {A}}$$
A
admits a first order potential.
Funder
Rheinische Friedrich-Wilhelms-Universität Bonn
Bonn International Graduate School
Publisher
Springer Science and Business Media LLC