Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solving a characteristic Cauchy problem   In this paper we give a meaning to the nonlinear characteristic Cauchy
problem for the Wave Equation in base form by replacing it by a family of
non-characteristic problems in an appropriate algebra of generalized functions.
We prove existence of a solution and we precise how it depends on the choice
made. We also check that in the classical case (non-characteristic) our new
solution coincides with the classical one.

7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an