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4 : LUMINOSITY FUNCTIONS
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(1) Introduction
(2) Brief History
(3) The Schechter Function
(4) Methods of Evaluating Luminosity Functions
      (a) Cluster Samples
      (b) Field Samples
            (i)   Classical Method
            (ii)  Differential/Cumulative Ratio Method
            (iii) The C Method
(5) Different LFs for Different Hubble Types
(6) Different LFs for Field and Clusters
(7) Physical Origin of the Luminosity Function