Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Infinity Cancellation, Type I' Compactification and String S-Matrix
  Functional   Nonvanishing tadpoles and possible infinities associated in the multiparticle
amplitudes are discussed with regard to the disk and $RP^{2}$ diagrams of the
Type I' compactification. We find that the infinity cancellation of $SO(32)$
type $I$ theory extends to this case as well despite the presence of tadpoles
localized in the D-brane world-volume and the orientifold surfaces. Formalism
of string S-matrix generating functional is presented to find a consistent
string background as c-number source function: we find this only treats the
cancellation of the tadpoles in the linearized approximation. Our formalism
automatically provides representation of the string amplitudes on this
background to all orders in $\alpha'$.

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The categories of this paper are: supr-con
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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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: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat