# Elementary matrices theory

Hello,

I need to find some theory about elementary matrices. That are the matrices in the form

$$\mathbf{E}(\sigma,\mathbf{u},\mathbf{v})=\mathbf{I}-\frac{1}{\sigma}\mathbf{uv}^{T}$$

I can't find anywhere some theory about it. Can you give me some useful links?

Thank you so much...

tiny-tim