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[Doc Al]

At this moment there is no Sigma icon.
What happened?

It's there. It's just not available in every forum, apparently. (Such as this one.)

 

[~christina~]

$$\frac{1} {\lambda _1} - \frac {\pi} {\lambda _{x-1_1}}$$

$$\sigma$$

 

[statdad]

$$S(\widehat \alpha, \widehat \beta_\text{R}) = \min_{(a, b) \in R^{p+1}} \sum_{i=1}^n \psi \left(\frac{\text{R}(y_i-(a+b \mathbf{x}_i))}{n+1}\right)(y_i - (a+b \mathbf{x}_i))$$

$$\sqrt n \left( \widehat \beta_\text{R} - \beta_0\left) \xrightarrow{\mathcal{D}} n_p \left(\mathbf 0, \Xi^{-1}\right)$$