Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Banach space dichotomy for quotients of subspaces   A Banach space $X$ with a Schauder basis is defined to have the restricted
quotient hereditarily indecomposable (QHI) property if $X/Y$ is hereditarily
indecomposable (HI) for any infinite codimensional subspace $Y$ with a
successive finite-dimensional decomposition on the basis of $X$. A reflexive
space with the restricted QHI property is in particular HI, has HI dual, and is
saturated with subspaces which are HI and have HI dual.
  The following dichotomy theorem is proved: any infinite dimensional Banach
space contains a quotient of subspace which either has an unconditional basis,
or has the restricted QHI property.

31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom