Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Elliptical Galaxies in Cluster Cores: Luminosity Functions and Selection
  Procedures   We present here the results about the determination of the Luminosity
Function (LF) for elliptical galaxies in the core of fairly rich clusters as a
function of redshift and try to compare with the known LF of close, better
studied clusters of galaxies. We then outline the first use of a new method of
selecting member elliptical galaxies using an unsupervised Artificial Neural
Network (ANN) working on a purely photometric set of data.

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The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: stat
31
The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th