We present some recent results, obtained jointly with Detlef Müller, on solvability of operators of the form where the are left-invariant vector fields on the Heisenberg group, such that () are the only nontrivial relations, and is a complex symmetric matrix with semi-definite real part. The presentation also contains references on the work done in the past few years in this area.
@article{JEDP_2000____A15_0,
author = {Ricci, Fulvio},
title = {Solvability of second-order left-invariant differential operators on the Heisenberg group},
journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
year = {2000},
pages = {1-10},
mrnumber = {2002c:22018},
zbl = {01808705},
language = {en},
url = {http://dml.mathdoc.fr/item/JEDP_2000____A15_0}
}
Ricci, Fulvio. Solvability of second-order left-invariant differential operators on the Heisenberg group. Journées équations aux dérivées partielles, (2000), pp. 1-10. http://gdmltest.u-ga.fr/item/JEDP_2000____A15_0/
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