Precedenti risultati riguardanti il principio di massimo generalizzato e la valutazione del primo autovalore per operatori uniformemente ellittici di tipo variazionale vengono estesi agli operatori subellittici di tipo Heisenberg non simmetrici e a coefficienti discontinui.
@article{BUMI_2001_8_4B_2_441_0, author = {M. Chicco and M. R. Lancia}, title = {Generalized maximum principle and evaluation of the first eigenvalue for Heisenberg-type operators with discontinuous coefficients}, journal = {Bollettino dell'Unione Matematica Italiana}, volume = {4-A}, year = {2001}, pages = {441-456}, zbl = {1164.35328}, mrnumber = {1831998}, language = {en}, url = {http://dml.mathdoc.fr/item/BUMI_2001_8_4B_2_441_0} }
Chicco, M.; Lancia, M. R. Generalized maximum principle and evaluation of the first eigenvalue for Heisenberg-type operators with discontinuous coefficients. Bollettino dell'Unione Matematica Italiana, Tome 4-A (2001) pp. 441-456. http://gdmltest.u-ga.fr/item/BUMI_2001_8_4B_2_441_0/
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