a8297af2   
   From: rrllff@yahoo.com   
      
   On May 3, 5:00 am, Narasimham Gudipaty    
   >   
   > Thanks Sam. Fermat time minimization could help set up the Cartesian oval's   
    differential equation. In this connection,is it possible to get or see   
   Newton's work involving bi-normals mentioned in Wikipadia?   
   >   
   > Narasimham   
      
   I don't have it with me but I believe there is a good description in   
   Born and Wolfe.   
      
   http:..www.richardfisher.com   
      
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