منابع مشابه
Some Non-analytic-hypoelliptic Sums of Squares of Vector Fields
Certain second-order partial differential operators, which are expressed as sums of squares of real-analytic vector fields in R3 and which are well known to be C hypoelliptic, fail to be analytic hypoelliptic.
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ژورنال
عنوان ژورنال: Topology
سال: 1973
ISSN: 0040-9383
DOI: 10.1016/0040-9383(73)90011-6