来源:Israel Journal of Mathematics, 2016, 211(1): 1-12.
DOI:10.1007/s11856-015-1269-2
摘要
We prove here an energy estimate for the Cauchy problem for hyperbolic equations with double characteristic, which contains both effectively and non-effectively points (see L. Hormander [3] and R. Melrose [8]) in a unique framework.