Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Abstract theory of pointwise decay with applications to wave and
  Schr\"odinger equations   We prove pointwise in time decay estimates via an abstract conjugate operator
method. This is then applied to a large class of dispersive equations.

23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess