4.14.1 Top new questions this week

4.14.1.1 How is a mathematical formula represented in PDF?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=428367

If I compile a .tex file to a PDF, how will the PDF encode a mathematical formula like f.ex. the integral below? Is it a bitmap? Or how else is it encoded? And how can I extract the formula from a PDF  ... 
[pdf] [input-encodings] [font-encodings] [bitmap] [extract]
 

asked by Numb3rs https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=161602 17 votes

answered by David Carlisle https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=1090 27 votes

4.14.1.2 Hiding searchable content in a PDF

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=427585

Is there a way to have searchable hidden text in a PDF using LaTeX? For example, is it possible to embed an ID that is searchable, but not visible? 
[xetex] [pdf]
 

asked by user9433640 https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=156232 15 votes

answered by Steven B. Segletes https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=25858 19 votes

4.14.1.3 What happens to ArXiV publications when their TeXLive is updated?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=428277

ArXiv expects you to upload sources. But - every once in a while - they upgrade their own TeX distribution (e.g. from TL 2011 to TL 2016, last year). This can affect how your document is rendered, and  ... 
[arxiv] [update]
 

asked by einpoklum https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=5640 13 votes

answered by moewe https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=35864 9 votes

4.14.1.4 Latex amsmath DeclareMathOperator

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=428041

In the short tutorial of ShareLatex, there is a sentence about DeclareMathOperator 
The command can be slightly modified if you need that your defined operator uses subscripts, as the \lim  ... 
[math-mode]
 

asked by Rivers Shall https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=161463 12 votes

answered by Harald Hanche-Olsen https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=1424 17 votes

4.14.1.5 How to build this formula in Latex?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=427985

I'm just trying to build the formula shown below in Latex. My approach would be the following: prob[ \tilde{n}=n \mid \tilde{s}=s] 
However, the first two n's are not displayed correctly. Does anyone  ... 
[math-mode]
 

asked by Michael https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=160189 11 votes

answered by Steven B. Segletes https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=25858 21 votes

4.14.1.6 Opacity effect for the backcover

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=427536

Here is a paragraph aimed to put at the back cover of a book. I want to have opacity effect for this because it is placed on top of a background picture of the back cover. How can I add opacity effect  ... 
[tikz-pgf]
 

asked by Thumbolt https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=69901 9 votes

answered by Thomas F. Sturm https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=30617 6 votes

4.14.1.7 Remove = sign before number when using siunitx round-minimum

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=428600

I am creating macros to format p values using siunitx. I want them to round to three decimal places, with anything below 0.001 given as <0.001. 
This works fine when printing a p value by itself,  ... 
[siunitx]
 

asked by pyrrhicPachyderm https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=161697 8 votes

answered by egreg https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=4427 6 votes