@pourjour For F^2 = U_1 +* W, if you want to get the point (x,y) let y + z = x and take (z,0)+*(y,y) = (z+y,y) = (x,y). You can do this for any point (x,y) in F^2 so hopefully you'll see it now.
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Anybody know what a spinor is? "Sure, it's just the square root of a geometry"
