Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Generalized Fierz Identities and the Superselection Rule for Geometric
  Multispinors   The inverse problem, to reconstruct the general multivector wave function
from the observable quadratic densities, is solved for 3D geometric algebra. It
is found that operators which are applied to the right side of the wave
function must be considered, and the standard Fierz identities do not
necessarily hold except in restricted situations, corresponding to the
spin-isospin superselection rule. The Greider idempotent and Hestenes
quaterionic spinors are included as extreme cases of a single superselection
parameter.

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The categories of this paper are: dg-ga
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The categories of this paper are: eess
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
2
The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph