Non-effectively hyperbolic operators with a spectral transition of the Hamilton map are shown to admit a general normal form, a tangent-bicharacteristic existence criterion, and an elementary factorization criterion in arbitrary codimension.
Cauchy problem for differential operators with double char- acteristics, volume 2202 of Lecture Notes in Mathematics
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Geometric results for hyperbolic operators with spectral transition of the Hamilton map
Non-effectively hyperbolic operators with a spectral transition of the Hamilton map are shown to admit a general normal form, a tangent-bicharacteristic existence criterion, and an elementary factorization criterion in arbitrary codimension.