Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Postnikov towers for real and complex connective K-theory   Complexification, from real connective K-theory to complex connective
K-theory, sits in a well-known cofiber sequence between multiplication by eta
and a map related to realification. We show how this cofiber sequence factors
as one goes up the Postnikov towers of ko and ku. There are 5 distinct cofiber
sequences which then repeat under Bott periodicity.

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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
3
The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
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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: q-fin