View source for Talk:Variance

Should it be $\operatorname{Var}X$ or $\operatorname{D}X$ ? Moreover I think that $\xi$, $\zeta$ is more appropriate for random variables then $X$, $Y$. What do you think? --[[User:Nikita2|Nikita2]] ([[User talk:Nikita2|talk]])

: Yes, $\operatorname{Var}X$, as noted in the "Comments". About $\xi$, $\zeta$ I am neutral; also $X$, $Y$ are OK with me. --[[User:Boris Tsirelson|Boris Tsirelson]] ([[User talk:Boris Tsirelson|talk]]) 08:55, 23 February 2013 (CET)

What about mathematical expectation symbol? How should we type it? I found this $\mathbb{E}$ but I think is should be like E. --[[User:Nikita2|Nikita2]] ([[User talk:Nikita2|talk]]) 06:01, 25 February 2013 (CET)

: Yes, E ($\mathsf{E}$, $\mathrm{E}$, $E$) are widely used. Also $\mathbb{E}$ is used. --[[User:Boris Tsirelson|Boris Tsirelson]] ([[User talk:Boris Tsirelson|talk]]) 07:44, 25 February 2013 (CET)