Suppose that there are $1 \times n$ vectors $x$ and $z$, $n \times n$ matrices $A$ and $B$, $n \times 1$ vector $y$.
If these are to satisfy $xABy=zBy$, what would be the relationship between these matrices and vectors?
Suppose that there are $1 \times n$ vectors $x$ and $z$, $n \times n$ matrices $A$ and $B$, $n \times 1$ vector $y$.
If these are to satisfy $xABy=zBy$, what would be the relationship between these matrices and vectors?