Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: No-interaction theorem without Hamiltonian and Lagrangian formalism:
  invariant momentum on null cones   In a previous paper (G.Yoneda, Proc.R.Soc.London, A445,(1994),221), we proved
the no-interaction theorem for four particles with the assumption that the
(linear and angular) momentum on space-like planes is invariant. In this paper,
we assume that the momentum on null cones is invariant and prove that there is
no interaction for four particles.

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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: hep-ph