Teoria delle quadriche

 
 

(1.1)  :

$\displaystyle f(x,y,z)$ $\displaystyle =$ $\displaystyle a_{11}x^2+a_{22}y^2+a_{33}z^2+2a_{12}xy+2a_{13}xz+$
    $\displaystyle +a_{23}yz+2a_{01}x+2a_{02}y+2a_{03}z+a_{00} \; = \; 0$







(1.2)  :

$\displaystyle \left(
 \begin{array}{cccc}
 1 & x & y & z\\  
 \end{array}
 \rig...
...al{A} \left(
 \begin{array}{c}
 1 \\  x \\  y \\  z\\  
 \end{array}
 \right)=0$