8.30.2 Greatest hits from previous weeks

8.30.2.1 \mathbb Z  yields undefined control sequence error
8.30.2.2 Real number symbol (UTF-8: a^\204\235) in XeTeX
8.30.2.3 How do I align an image to center?
8.30.2.4 How to write 'A~\[Currency]' and other umlauts and accented letters in bibliography?
8.30.2.5 Table with multiple lines in some cells
8.30.2.6 Matrix in Latex
8.30.2.7 LaTeX Editors/IDEs
8.30.2.1 \mathbb Z  yields undefined control sequence error

https://tex.stackexchange.com/landing/r/digest?cta=question&id=38769

I am using WinEdt 6 for compiling my TeX documents. I am getting an error with contains the line $\mathbb{Z}$ showing that it is undefined control sequence. How should I rectify it? Should I include ... 
[math-mode] [errors] [symbols]
 
asked by Ramana Venkata https://tex.stackexchange.com/landing/r/digest?cta=user&id=10154 Score of 214
8.30.2.2 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 165
answered by lvaneesbeeck https://tex.stackexchange.com/landing/r/digest?cta=user&id=24686 Score of 11
8.30.2.3 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 76
answered by gcedo https://tex.stackexchange.com/landing/r/digest?cta=user&id=13680 Score of 81
8.30.2.4 How to write 'A~\[Currency]' and other umlauts and accented letters in bibliography?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=57743

How to write in bibliography (package natbib) letter "a" with two dots above? Specially, I mean the word BirkhA~\[Currency]user. 
Is there a general rule or way how to write such umlauts or other accented letters ... 
[bibtex] [accents] [characters]
 
asked by Laura https://tex.stackexchange.com/landing/r/digest?cta=user&id=14475 Score of 397
answered by Mico https://tex.stackexchange.com/landing/r/digest?cta=user&id=5001 Score of 534
8.30.2.5 Table with multiple lines in some cells

https://tex.stackexchange.com/landing/r/digest?cta=question&id=40561

What is the easiest way to have 2 lines in some of the cells in a table? 
The only way I can think right now is to actually have 2 separate rows (without the line in the middle) and use \multirow on ... 
[tables]
 
asked by Grzenio https://tex.stackexchange.com/landing/r/digest?cta=user&id=3329 Score of 196
answered by Werner https://tex.stackexchange.com/landing/r/digest?cta=user&id=5764 Score of 178
8.30.2.6 Matrix in Latex

https://tex.stackexchange.com/landing/r/digest?cta=question&id=204621

I am new to Latex, and I have been trying to get the matrix of following form 
[x11 x12 x13 . . . . x1n 
x21 x22 x23 . . . . x2n 
. 
. 
. 
. 
xd1 xd2 xd3 . . . . xdn] 
... 
[matrices]
 
asked by Lakshmi Narayanan https://tex.stackexchange.com/landing/r/digest?cta=user&id=63361 Score of 135
answered by skpblack https://tex.stackexchange.com/landing/r/digest?cta=user&id=42912 Score of 207
8.30.2.7 LaTeX Editors/IDEs

https://tex.stackexchange.com/landing/r/digest?cta=question&id=339

What editors/IDEs are available for easing the process of writing TeX/LaTeX documents? 
Please state some useful features like code completion, spell checking, building final DVI or PDF files, etc. 
... 
[editors] [big-list] [ide] [resources]
 
asked by hayalci https://tex.stackexchange.com/landing/r/digest?cta=user&id=183 Score of 900
answered by YuppieNetworking https://tex.stackexchange.com/landing/r/digest?cta=user&id=146 Score of 356