9.58.2 Greatest hits from previous weeks

9.58.2.1 How do you get \mathbb 1  to work (characteristic function of a set)?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=26637

I am trying to get the digit one printed the \mathbb{} font in math mode, however the command 
\mathbb{1} 
outputs some rubbish. I certainly saw the character I am after in some pdf's generated from ... 
[math-mode] [formatting]
 

asked by Grzenio https://tex.stackexchange.com/landing/r/digest?cta=user&id=3329 Score of 239

9.58.2.2 Math symbol question: Vertical bar for ''evaluated at ...''

https://tex.stackexchange.com/landing/r/digest?cta=question&id=40160

How do I insert the line "|" after the equation in LaTeX (see image below)? 
I'm using LyX so if you can point me to the symbol of that line is also OK. 
I don't know if this line has a proper name so ... 
[math-mode] [symbols] [lyx]
 

asked by rasgo https://tex.stackexchange.com/landing/r/digest?cta=user&id=10511 Score of 194

9.58.2.3 How can I split an equation over two (or more) lines

https://tex.stackexchange.com/landing/r/digest?cta=question&id=3782

I am having the following equation: 
\begin{equation} 
Q(\lambda,\hat{\lambda}) = -\frac{1}{2} P(O \mid \lambda ) \sum_s \sum_m \sum_t \gamma_m^{(s)} (t) \left( n \log(2 \pi ) + \log \left| C_m^{(s)} ... 
[math-mode] [equations] [line-breaking] [breqn]
 

asked by Peter Smit https://tex.stackexchange.com/landing/r/digest?cta=user&id=459 Score of 344

answered by Will Robertson https://tex.stackexchange.com/landing/r/digest?cta=user&id=179 Score of 214

9.58.2.4 Is there a way to slightly shrink a table, including font size, to fit within the column boundaries?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=10863

I have a table that is just a little too wide for a 3.33" column. Is there a way to simply shrink the table a little to make it fit? I'm OK if the 10pt font becomes 9pt-something. Here is an example. 
... 
[tables] [scaling]
 

asked by Nathan Farrington https://tex.stackexchange.com/landing/r/digest?cta=user&id=3504 Score of 197

answered by Martin Scharrer https://tex.stackexchange.com/landing/r/digest?cta=user&id=2975 Score of 286

9.58.2.5 Real number symbol (UTF-8: a^\204\235) in XeTeX

https://tex.stackexchange.com/landing/r/digest?cta=question&id=104274

How can I get the 'real number' sign (something like \mathbb{R} with the amssymb package in LaTeX) in XeTeX? 
[math-mode] [xetex] [symbols] [amsmath] [plain-tex]
 

asked by lvaneesbeeck https://tex.stackexchange.com/landing/r/digest?cta=user&id=24686 Score of 170

answered by lvaneesbeeck https://tex.stackexchange.com/landing/r/digest?cta=user&id=24686 Score of 10

9.58.2.6 Align equation left

https://tex.stackexchange.com/landing/r/digest?cta=question&id=145657

Here is my split equation: 
\documentclass{article} 
\usepackage{amsmath} 
\begin{document} 
\begin{equation} 
\begin{split} 
a_{ijk} =& \frac {Pr(M_{I} =2  \&  M_J=1 \& M_K =1 | I=i , J=j , K=... 
[equations] [align]
 

asked by user35571 https://tex.stackexchange.com/landing/r/digest?cta=user&id=35571 Score of 123

answered by Ludovic C. https://tex.stackexchange.com/landing/r/digest?cta=user&id=31058 Score of 115

9.58.2.7 Absolute Value Symbols

https://tex.stackexchange.com/landing/r/digest?cta=question&id=43008

What is the "best LaTeX practices" for writing absolute value symbols?  Are there any packages which provide good methods? 
Some options include|x| and \mid x \mid, but I'm not sure which is best... 
[math-mode] [symbols]
 

asked by jamaicanworm https://tex.stackexchange.com/landing/r/digest?cta=user&id=9757 Score of 316

answered by Peter Grill https://tex.stackexchange.com/landing/r/digest?cta=user&id=4301 Score of 239