10.5.2 Greatest hits from previous weeks

10.5.2.1 Why do the less than symbol (<) and the greater than symbol (>) appear wrong as upside down exclamation (A^\[DownExclamation]) or question mark (A^\[DownQuestion])?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=2369

When typing < or > in LaTeX and compiling with pdflatex, the less than and greater than symbols appear at upside down exclamation points. I'm not in math mode. 
[symbols] [punctuation] [font-encodings]
 

asked by biased_estimator https://tex.stackexchange.com/landing/r/digest?cta=user&id=996 Score of 318

answered by Stefan Kottwitz https://tex.stackexchange.com/landing/r/digest?cta=user&id=213 Score of 288

10.5.2.2 \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 247

10.5.2.3 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 415

answered by Mico https://tex.stackexchange.com/landing/r/digest?cta=user&id=5001 Score of 567

10.5.2.4 Big Parenthesis in an Equation

https://tex.stackexchange.com/landing/r/digest?cta=question&id=38868

I have an equation contained inside \[...\], which automatically makes a \sum with sub- and superscripts turn big--so that the summation sign looks awkward inside parenthesis.  Any idea how to make ... 
[math-mode] [delimiters]
 

asked by jamaicanworm https://tex.stackexchange.com/landing/r/digest?cta=user&id=9757 Score of 258

answered by qubyte https://tex.stackexchange.com/landing/r/digest?cta=user&id=9043 Score of 380

10.5.2.5 Scale image to page width?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=39147

I use 
\inclugraphics[scale=TRYING TO GUESS THE NUMBER FOR PAGE WIDTH]{...} 
but I find this errorsome, is there some ready flag to set the image to page width? I usually use PNG and JPG photos. 
[graphics] [scaling]
 

asked by hhh https://tex.stackexchange.com/landing/r/digest?cta=user&id=2956 Score of 293

answered by Werner https://tex.stackexchange.com/landing/r/digest?cta=user&id=5764 Score of 276

10.5.2.6 How to change certain pages into landscape/portrait mode

https://tex.stackexchange.com/landing/r/digest?cta=question&id=337

How can I change the orientation of some pages of my document into landscape mode, while leaving the others in portrait mode (or vice versa)? 
[landscape]
 

asked by hayalci https://tex.stackexchange.com/landing/r/digest?cta=user&id=183 Score of 441

answered by rcs https://tex.stackexchange.com/landing/r/digest?cta=user&id=118 Score of 457

10.5.2.7 How to add an empty line between paragraphs?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=135134

I have two sections which I'd like to separate by an empty line. Every time I press Enter, LyX removes that empty line between paragraphs. How do I prevent this? 
[spacing] [lyx]
                                                                                  

                                                                                  
 

asked by goldisfine https://tex.stackexchange.com/landing/r/digest?cta=user&id=37301 Score of 162

answered by Werner https://tex.stackexchange.com/landing/r/digest?cta=user&id=5764 Score of 174