The nodal line of the second eigenfunction of the Laplacian in $\mathbb{R}^2$ can be closed
Hoffmann-Ostenhof, M. ; Hoffmann-Ostenhof, T. ; Nadirashvili, N.
Duke Math. J., Tome 90 (1997) no. 1, p. 631-640 / Harvested from Project Euclid
Publié le : 1997-12-15
Classification:  35P15,  35J05
@article{1077232816,
     author = {Hoffmann-Ostenhof, M. and Hoffmann-Ostenhof, T. and Nadirashvili, N.},
     title = {The nodal line of the second eigenfunction of the Laplacian
 in $\mathbb{R}^2$ 
 can be closed},
     journal = {Duke Math. J.},
     volume = {90},
     number = {1},
     year = {1997},
     pages = { 631-640},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1077232816}
}
Hoffmann-Ostenhof, M.; Hoffmann-Ostenhof, T.; Nadirashvili, N. The nodal line of the second eigenfunction of the Laplacian
 in $\mathbb{R}^2$ 
 can be closed. Duke Math. J., Tome 90 (1997) no. 1, pp.  631-640. http://gdmltest.u-ga.fr/item/1077232816/