Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the convexity of Relativistic Hydrodynamics   The relativistic hydrodynamic system of equations for a perfect fluid obeying
a causal equation of state is hyperbolic (Anile 1989 {\it Relativistic Fluids
and Magneto-Fluids} (Cambridge: Cambridge University Press)). In this report,
we derive the conditions for this system to be convex in terms of the
fundamental derivative of the equation of state (Menikoff and Plohr 1989 {\it
Rev. Mod. Phys.} {\bf 61} 75). The classical limit is recovered.

11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
18
The categories of this paper are: econ