Electronic Resource
Springer
Mathematische Zeitschrift
230 (1999), S. 241-257
ISSN:
0025-5874
Keywords:
Mathematics Subject Classification (1991):35H05
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mathematics
Notes:
Abstract. We consider a class of degenerate elliptic operators on a torus and prove that global hypoellipticity is equivalent to an algebraic condition involving Liouville vectors and simultaneous approximability. For another class of operators we show that the zero order term may influence global hypoellipticity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/PL00004693
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