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ABSTRACT. This brief review is intended to provide students with an
introduction to the concepts and terminology associated with galaxy
luminosity functions, particularly as used in the discussion of
clusters of galaxies. Several of the lecturers refer in passing to
L
,
the RORF, and other simple concepts which may be unfamiliar to
beginning graduate students. The purpose of this lecture is to clarify
the idea of a luminosity function, and describe some commonly used
forms for the optical, radio, and infrared luminosity functions of
galaxies.
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