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            | Abstract |  
            | We consider power series with positive completely multiplicative coefficients. We obtain a
 large family of power series that have the unit circle as natural boundary, as well as new
 
-theorems for power
 series with positive completely multiplicative coefficients when the argument tends to roots of unity.
 Also 
-estimates
 for some partial sums of completely multiplicative functions are given.
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            | Keywords
                power series, positive completely multiplicative
                coefficients, completely multiplicative functions, Omega
                estimates
               |  
          
            | Mathematical Subject Classification 2010
                Primary: 11N37
               
                Secondary: 30B30
               |  
          
            | Milestones
                Received: 12 September 2018
               
                Revised: 21 March 2020
               
                Accepted: 5 April 2020
               
                Published: 11 May 2020
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