Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The circle action on topological Hochschild homology of complex
  cobordism and the Brown-Peterson spectrum   We specify exterior generators for $\pi_* THH(MU) = \pi_*(MU) \otimes
E(\lambda'_n \mid n\ge1)$ and $\pi_* THH(BP) = \pi_*(BP) \otimes E(\lambda_n
\mid n\ge1)$, and calculate the action of the $\sigma$-operator on these graded
rings. In particular, $\sigma(\lambda'_n) = 0$ and $\sigma(\lambda_n) = 0$,
while the actions on $\pi_*(MU)$ and $\pi_*(BP)$ are expressed in terms of the
right units $\eta_R$ in the Hopf algebroids $(\pi_*(MU), \pi_*(MU \wedge MU))$
and $(\pi_*(BP), \pi_*(BP \wedge BP))$, respectively.

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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: econ