Kodai Mathematical Journal
Online ISSN : 1881-5472
Print ISSN : 0386-5991
ISSN-L : 0386-5991
A note on necessary conditions of hypoellipticity for some classes of differential operators with double characteristics
Nguyen Minh Tri
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2000 Volume 23 Issue 2 Pages 281-296

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Abstract
We construct explicit formulas for fundamental solutions and global non-smooth solutions at degenerate points of some classes of differential operators with double characteristics. A new elementary proof for non-hypoellipticity is given.
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© Department of Mathematics, Tokyo Institute of Technology
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