9.62.2 Greatest hits from previous weeks

9.62.2.1 How can I write cases with grouping braces on both left and right side, and split the condition into two lines in LaTeX?
9.62.2.2 Error in TeX Live a^\200\223 Font ... not loadable: Metric (TFM) file not found
9.62.2.3 Integrating Grammarly with online LaTeX editors such as overleaf?
9.62.2.4 How do you get \mathbb 1  to work (characteristic function of a set)?
9.62.2.5 How do I align an image to center?
9.62.2.6 How can I split an equation over two (or more) lines
9.62.2.7 Not equal sign (a^\211 ) with a vertical bar
9.62.2.1 How can I write cases with grouping braces on both left and right side, and split the condition into two lines in LaTeX?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=240868

The code I used to write 
is this one 
$$ 
X(m,n)= 
\begin{cases} 
x(n),\\ 
x(n-1)\\ 
x(n-1) 
\end{cases} 
$$ 
But I don't know how to write this one 
Also, what if I want to write this 
[math-mode] [cases]
 
asked by MaryA~ https://tex.stackexchange.com/landing/r/digest?cta=user&id=65856 Score of 201
answered by Ignasi https://tex.stackexchange.com/landing/r/digest?cta=user&id=1952 Score of 141
9.62.2.2 Error in TeX Live a^\200\223 Font ... not loadable: Metric (TFM) file not found

https://tex.stackexchange.com/landing/r/digest?cta=question&id=75166

I freshly installed 'basic' version of TeX Live 2012 (not full, only basic version). 
I have following line in my code: 
\usepackage[T1]{fontenc} 
I get following error: 
(/usr/local/texlive/2012/texmf-... 
[fonts] [errors] [packages] [texlive] [font-encodings]
 
asked by abhinavkulkarni https://tex.stackexchange.com/landing/r/digest?cta=user&id=12992 Score of 149
answered by mpg https://tex.stackexchange.com/landing/r/digest?cta=user&id=1239 Score of 116
9.62.2.3 Integrating Grammarly with online LaTeX editors such as overleaf?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=333947

Grammarly does not work with LaTex, but I believe it still can be helpful: 
I like to use Grammarly Chrome extension with an online Latex editor. I tried sharelatex, overleaf , authorea and verbosus ... 
[tools] [online] [grammar]
 
asked by Sadegh https://tex.stackexchange.com/landing/r/digest?cta=user&id=93219 Score of 141
9.62.2.4 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 240
9.62.2.5 How do I align an image to center?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=53862

How do I align an image to center? 
In a beamer presentation I have a 2-3 items on a slide followed by an image. 
The image is not wide enough to cover whole slide, so it leaves around 30% space from ... 
[beamer] [horizontal-alignment]
 
asked by epsilon8 https://tex.stackexchange.com/landing/r/digest?cta=user&id=12860 Score of 81
answered by gcedo https://tex.stackexchange.com/landing/r/digest?cta=user&id=13680 Score of 88
9.62.2.6 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 346
answered by Will Robertson https://tex.stackexchange.com/landing/r/digest?cta=user&id=179 Score of 216
9.62.2.7 Not equal sign (a^\211 ) with a vertical bar

https://tex.stackexchange.com/landing/r/digest?cta=question&id=108193

Is it possible to get a \neq but with a vertical bar instead of a slanted one? There are inequality operators like AMS's \gvertneqq that feature this kind of "not equal" but not without mixing it with ... 
[math-mode] [symbols] [relation-symbols]
 
asked by Christian https://tex.stackexchange.com/landing/r/digest?cta=user&id=13450 Score of 45