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The third logarithmic coefficient in certain subclasses of close-to-convex functions

  • Adam Lecko,
  • Young Jae Sim

摘要

For analytic functions f in the unit disk \({\mathbb {D}}\) D normalized by \(f(0)=0\) f ( 0 ) = 0 and \(f'(0)=1\) f ( 0 ) = 1 satisfying in \({\mathbb {D}}\) D the condition \({{\,\textrm{Re}\,}}\{ (1-z)f'(z) \}> 0,\ {{\,\textrm{Re}\,}}\{ (1-z^2)f'(z) \}> 0,\ {{\,\textrm{Re}\,}}\{ (1-z+z^2)f'(z) \}> 0,\ {{\,\textrm{Re}\,}}\{ (1-z)^2f'(z) \} > 0,\) Re { ( 1 - z ) f ( z ) } > 0 , Re { ( 1 - z 2 ) f ( z ) } > 0 , Re { ( 1 - z + z 2 ) f ( z ) } > 0 , Re { ( 1 - z ) 2 f ( z ) } > 0 , respectively, the upper bound of the third logarithmic coefficient was computed.