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**what kind of math language is this?**

$I\subset \reals$

$$\gamma_i:I_i\rightarrow M,\quad I_i\subset\reals,\quad i=1,2$$

$\sigma_{\alpha\beta}$ , let $$\rJ\sigma_{\alpha\beta}:V_{\alpha\beta}\rightarrow \Mat_{n,n}(\reals)$$

I have seen this notation thrown around in this forum, but I never understood what they mean.

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