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math.AP2021
Improved regularity of second derivatives for subharmonic functions
Xavier Fernández-Real, Riccardo Tione
In this note, we prove that if a subharmonic function has pure second derivatives that are signed measures, then their negative part $(\partial_{ii} u)_…
math.AP2021
The four-state problem and convex integration for linear differential operators
Massimo Sorella, Riccardo Tione
We show that the four-state problem for general linear differential operators is flexible. The only flexibility result available in this context is the one for the five-state probl…