Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The third-order law for increments in magnetohydrodynamic turbulence
  with constant shear   We extend the theory for third-order structure functions in homogeneous
incompressible magnetohydrodynamic (MHD) turbulence to the case in which a
constant velocity shear is present. A generalization is found of the usual
relation [Politano and Pouquet, Phys. Rev. E, 57 21 (1998)] between third-order
structure functions and the dissipation rate in steady inertial range
turbulence, in which the shear plays a crucial role. In particular, the
presence of shear leads to a third-order law which is not simply proportional
to the relative separation. Possible implications for laboratory and space
plasmas are discussed.

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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
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The categories of this paper are: stat
1
The categories of this paper are: cs
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The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom