Abstract
This paper is one of a series devoted to the Cauchy problem for an equation of the form
with small Cauchy data
Here □ = 2 t − Δ is the wave operator in R 1+n, with variables denoted by t = x 0 and x = (x1,..., x n ), G is a C ∞ function vanishing of second order at the origin, u′ and u″ denote all first and second order derivates of u, and u j ∈ C ∞0 . General results have been obtained with simple proofs based on the idea of Klainerman [13] to use enrgy integral estimates for all equations obtained from (1.1) by multiplication with any product Ẑ Iof │I│ vector fields ∂/∂x j , j = 0, …, n, the infinitesimal generators of the Lorents group
which commute with □, and the radial vector field
(We shall use the notation Z I for products of the vector fields (1.3), (1.4) only; note that these preserve homogeneity.) However, in low dimension the results are not always optimal when G depends on u itself.
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Hörmander, L. (1991). On the Fully Non-Linear Cauchy Problem with Small Data. II.. In: Beals, M., Melrose, R.B., Rauch, J. (eds) Microlocal Analysis and Nonlinear Waves. The IMA Volumes in Mathematics and its Applications, vol 30. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-9136-4_6
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