Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Casimir Energy due to a Semi-Infinite Plane Boundary   Following the derivation of the Green function for the massless scalar field
satisfying the Dirichlet boundary condition on the Plane (x > 0, y = 0), we
calculate the Casimir energy.

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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: chem-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
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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: acc-phys