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4 : LUMINOSITY FUNCTIONS
     Questions     Refs.    (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)  Maximum Likelihood Method
            (iii) Testing Completeness with V / V_max
(5) Different LFs for Different Hubble Types
(6) Different LFs for Different Environments
(7) Physical Origin of the Luminosity Function