Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Equation Systems of Generalized Hydrodynamics for Soft-Matter
  Quasicrystals   The equation systems of generalized hydrodynamics, or generalized dynamics
for simplicity, for soft-matter quasicrystals were established. Considering the
fluidity of the matter with high order we introduced a new elementary
excitation---fluid phonon to the quasicrystals, and the equation of state is
necessary and introduced too. By considering other two elementary
excitations---phonons and phasons, a theory---generalized hydrodynamics for
soft-matter quasicrystals is set up, in which the governing equations of the
dynamics are reported in this letter.

7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn