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## Main Question or Discussion Point

Hello,

I need to find some theory about

[tex]\mathbf{E}(\sigma,\mathbf{u},\mathbf{v})=\mathbf{I}-\frac{1}{\sigma}\mathbf{uv}^{T}[/tex]

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

Thank you so much...

I need to find some theory about

**elementary matrices**. That are the matrices in the form[tex]\mathbf{E}(\sigma,\mathbf{u},\mathbf{v})=\mathbf{I}-\frac{1}{\sigma}\mathbf{uv}^{T}[/tex]

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

Thank you so much...