2 papers
math.AP2026
A spherical flatness index and a stability inequality for harmonic pseudospheres
Andrea Buffoni, Giovanni Cupini, Ermanno Lanconelli
We introduce a new flatness index for the boundary of an open subset of , . This index provides a necessary condition for to be a harmonic p…
math.AP2024
A representation formula for regular functions on the characteristic plane of the second Heisenberg group
Annalisa Baldi, Giovanna Citti, Giovanni Cupini
The aim of this paper is to study a Laplace-type operator and its fundamental solution on the characteristic plane in the Heisenberg group . We introduce a conformal…