Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metric and topological homology. Projectivity, injectivity and flatness   In this book we study metric and topological versions of projectivity
injectivity and flatness of Banach modules over Banach algebras. These two
non-standard versions of Banach homology theories are studied in parallel under
unified approach.

33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex