is f a linear mapping? How do i start this question??
thanx
Is it true that: $\displaystyle f(\bold{x} + \bold{y}) = f(\bold{x})+f(\bold{y})$ and $\displaystyle f(a\bold{x}) = af(\bold{x})$
Where $\displaystyle \bold{x} = (x_1,x_2,x_3)$ and $\displaystyle \bold{y} = (y_1,y_2,y_3)$.