On Friday, May 24, 2019 at 3:29:19 PM UTC-7, MM wrote:   
   > Hello all.   
   > Straight to the point, stemming from a problem concerning a phi^3   
   > potential.   
   >   
   > How to find out the series expansion for s = s(t) given by the implicit   
   > equation:   
   >   
   > 18 t + s(1+s) (1+2s) =0   
   >   
   > There actually exists a closed expression for series   
   > s(t) = sum_k s_k t^k   
      
   Since t is a cubic in s, you could use the solution of the cubic to get   
   s(t) - no series necessary.   
      
   > Anyone has some ideas? Thanks.   
      
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