LOCAL AND MICROLOCAL CAUCHY PROBLEM FOR NON-EFFECTIVELY HYPERBOLIC OPERATORS
2014 ◽
Vol 11
(01)
◽
pp. 185-213
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Keyword(s):
We study differential operators of order 2 and establish new energy estimates which ensure that the micro supports of solutions to the Cauchy problem propagate with finite speed. We then study the Cauchy problem for non-effectively hyperbolic operators with no null bicharacteristic tangent to the doubly characteristic set and with zero positive trace. By checking the energy estimates, we ensure the propagation with finite speed of the micro supports of solutions, and we prove that the Cauchy problem for such non-effectively hyperbolic operators is C∞ well-posed if and only if the Levi condition holds.
2015 ◽
Vol 12
(03)
◽
pp. 535-579
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2020 ◽
Vol 17
(01)
◽
pp. 75-122
2006 ◽
Vol 133
(31)
◽
pp. 176-186
1990 ◽
Vol 427
(1872)
◽
pp. 221-239
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2011 ◽
Vol 52
(5)
◽
pp. 864-870
◽
1981 ◽
Vol 40
(1)
◽
pp. 7-36
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