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Article Contents

ABSTRACT

1.INTRODUCTION - LUMINOSITY FUNCTIONS

2.INTRODUCTION - DWARF GALAXIES

3.INTRODUCTION - CLUSTERS

4.TECHNIQUES

5.THE LUMINOSITY FUNCTIONS OF THE CORES OF RICH CLUSTERS

6.COMPARISON BETWEEN CLUSTERS AND THE FIELD

7.THE TYPES OF THE FAINTEST GALAXIES IN RICH CLUSTERS

8.THE LOWEST SURFACE-BRIGHTNESS GALAXIES

9.THE MASS FUNCTION

REFERENCES