Nello spazio affine tridimensionale A 3 ( R ) le rette r : 2x-y+z=1 , x+y+z=-1 ...
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Nello spazio affine tridimensionale A3(R) le rette
r: 2x-y+z=1 , x+y+z=-1
s: x+y+2z=0 , x-z=2
sono:
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