Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Operator Fractional Brownian Motion and Martingale Differences   It is well known that martingale difference sequences are very useful in
applications and theory. On the other hand, the operator fractional Brownian
motion as an extension of the well-known fractional Brownian motion also plays
important role in both applications and theory. In this paper, we study the
relationship between them. We will construct an approximation sequence of
operator fractional Brownian motion based on a martingale difference sequence.

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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: nlin
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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: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex