how to find 3 linearly independent tangent vector fields on S^3?
I can find a non vanishing vector tangent vector field to S^{2n+1}.
I tried with the following: X1(a,b,c,d)= (c,0,-a,0), X2(a,b,c,d)=(-b,a,0,0), X3(a,b,c,d)= (-d,0,0,a)
But these are not linearly independent when a=0.