How to write twisted cubic in sage?
 
  
 
  
 
 
 
 
 
 
    
        
        asked 11 years ago  
 
 Neda gravatar image  
 
 
 
 
 
Hello
 
could you please tell me how can I write twisted cubic
 
( {cost,sint | t in R}= v(x^2+y^2-1) )
 
in sage? should I use subscheme command and introduce it as an affine variety?
 
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Your equation looks like a circle... What do you mean by "write" ? What do you want to do with your object ? Plot it ? Compute rational points ?
vdelecroix gravatar imagevdelecroix (
    
        11 years ago
    )
1
The twisted cubic in parametric form is: 
var('t');
parametric_plot3d((t,t^2,t^3),(t,0,4),thickness=3)

calc314 gravatar imagecalc314 (
    
        11 years ago
    )

 should I introduce affine space then use v.rational_points( bound=..) ? 
Neda gravatar imageNeda (
    
        11 years ago
    )
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