I have the expression $nn\cdot A $
Where $n$ is a vector, $A$ is a matrix, and $\cdot$ is the dot product. This apparently evaluates to a matrix, but that makes no sense, as dot products only apply to vectors right?
I have the expression $nn\cdot A $
Where $n$ is a vector, $A$ is a matrix, and $\cdot$ is the dot product. This apparently evaluates to a matrix, but that makes no sense, as dot products only apply to vectors right?
You may want to give more context, but things like this occasionally come up in physics. For instance $r\cdot\sigma=x\sigma_x+y\sigma_y+z\sigma_z,$ where $\sigma_i$ are Pauli matrices. The result of this is a sum of three matrices which is again a matrix.