8.84.2 Greatest hits from previous weeks

8.84.2.1 How do I put text over symbols?
8.84.2.2 What are all the font styles I can use in math mode?
8.84.2.3 Why do the less than symbol (<) and the greater than symbol (>) appear wrong as upside down exclamation (A^\[DownExclamation]) or question mark (A^\[DownQuestion])?
8.84.2.4 Change line spacing inside the document
8.84.2.5 Reduce space between enumerated items
8.84.2.6 Making the bibliography appear in the table of contents
8.84.2.7 Force figure placement in text
8.84.2.1 How do I put text over symbols?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=74125

This is difficult for me to explain, but how do I put words over a symbol? For instance, I want to add words over an equal sign. Anyone know the command/syntax for that? 
Also adding ^ doesn't cut it..... 
[syntax]
 
asked by Lemon https://tex.stackexchange.com/landing/r/digest?cta=user&id=10554 Score of 150
8.84.2.2 What are all the font styles I can use in math mode?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=58098

As can be seen in above picture, there are lots of fonts or font styles that can be used in math mode. 
What are all the fonts or font styles I can use in math mode, and which packages are required in ... 
[fonts] [math-mode] [big-list] [latin-modern] [computer-modern]
 
asked by doncherry https://tex.stackexchange.com/landing/r/digest?cta=user&id=4012 Score of 561
answered by Christian https://tex.stackexchange.com/landing/r/digest?cta=user&id=13450 Score of 717
8.84.2.3 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 309
answered by Stefan Kottwitz https://tex.stackexchange.com/landing/r/digest?cta=user&id=213 Score of 276
8.84.2.4 Change line spacing inside the document

https://tex.stackexchange.com/landing/r/digest?cta=question&id=83855

This is my code 
\documentclass[12pt,a4paper]{book} 
\renewcommand{\baselinestretch}{1.5} 
\begin{document} 
\include{Chapter1} 
\end{document} 
I have please a question: 
I would change the line ... 
[line-spacing]
 
asked by researcher https://tex.stackexchange.com/landing/r/digest?cta=user&id=16097 Score of 165
8.84.2.5 Reduce space between enumerated items

https://tex.stackexchange.com/landing/r/digest?cta=question&id=6081

Background 
All book figures are set to "here definitely" (as they must come after the text that introduces them). 
Problem 
The list types (enumerated and bullet) have too much space between them. ... 
[spacing] [floats] [lists] [vertical-alignment] [positioning]
 
asked by Dave Jarvis https://tex.stackexchange.com/landing/r/digest?cta=user&id=2148 Score of 199
answered by lockstep https://tex.stackexchange.com/landing/r/digest?cta=user&id=510 Score of 24
8.84.2.6 Making the bibliography appear in the table of contents

https://tex.stackexchange.com/landing/r/digest?cta=question&id=8458

I need to make my (BibTeX) references section appear in the table of contents of my LaTeX document (documentclass: article), with section numbering too. 
My approach until now has been making a new ... 
[sectioning] [table-of-contents] [bibliographies]
 
asked by Genba https://tex.stackexchange.com/landing/r/digest?cta=user&id=2311 Score of 234
answered by lockstep https://tex.stackexchange.com/landing/r/digest?cta=user&id=510 Score of 176
8.84.2.7 Force figure placement in text

https://tex.stackexchange.com/landing/r/digest?cta=question&id=8625

I have a problem when a lot of figures are in question. Some figures tend to "fly around", that is, be a paragraph below, although I placed them before that paragraph. I use code: 
\begin{figure}[ht] 
\... 
[floats] [positioning] [captions]
 
asked by Marin https://tex.stackexchange.com/landing/r/digest?cta=user&id=2755 Score of 623
answered by Juan A. Navarro https://tex.stackexchange.com/landing/r/digest?cta=user&id=169 Score of 763