Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Schr\"odinger type propagators, pseudodifferential operators and
  modulation spaces   We prove continuity results for Fourier integral operators with symbols in
modulation spaces, acting between modulation spaces. The phase functions belong
to a class of nondegenerate generalized quadratic forms that includes
Schr\"odinger propagators and pseudodifferential operators. As a byproduct we
obtain a characterization of all exponents $p,q,r_1,r_2,t_1,t_2 \in [1,\infty]$
of modulation spaces such that a symbol in $M^{p,q}(\mathbb R^{2d})$ gives a
pseudodifferential operator that is continuous from $M^{r_1,r_2}(\mathbb R^d)$
into $M^{t_1,t_2}(\mathbb R^d)$.

24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys