53faab07   
   From: mathma18@gmail.com   
      
   On May 3, 9:54 pm, Salmon Egg  wrote:   
   > In article ,   
   >  Narasimham Gudipaty  wrote:   
      
   > > 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?   
   >   
   > I have not read about bi-normals. My guess is that part of Newton's work   
   > is not useful. His particle approach to optics was fundamentally wrong,   
   > but was the best available at the time. The modern quantum theory of   
   > light fits in more closely to what became the quantized version of the   
   > wave theory of light.   
   >   
   > Please do not take this statement as a disparagement of Newton's work.   
   > He could not possibly know everything including stuff that seems pretty   
   > simple to us now.   
      
   In geometric optics Newton with his more powerful  differential form   
   approach easily looked   
   through Descartes' error when he stuck to his own cartesian form to   
   speculate....   
      
   There are no Limacon aplanats in existence todate or ever, I think.   
      
   Narasimham   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)