Please, I want to add a subsection to the existing section in my chapter 1.  How can I do that? For example, I have 1.2.1 and I want to add 1.2.2. How do I go about that?
Which book (free or otherwise) was the most useful to you when you started learning LaTeX?  I am frequently asked this question by friends who want to learn LaTeX, and I recommend the book which got me started, , but I feel that there might be better options around.  Also see .
Restrict certain mods to certain worlds How do Natures work? In at least some Pokemon games there are modifiers called "Natures" which affect pokemon stats. What do they do and how do it work? Also, what specific games possess it? Proving normality of affine schemes One of the exercises in Ravi Vakil's algebraic geometry notes, Ex. $5.4.$I(b), is to show that    $$ \operatorname{Spec}\left(k[x_1, \ldots, x_n]/(x_1^2 + \cdots + x_m^2)\right) $$   is normal, where $k$ is any field of $\operatorname{char}(k)\neq 2$, and $n \geq m \geq 3$.    I have absolutely no idea how to get started on this. Is there anyone that could give a hint as to how one would approach this problem? Why are there two sets of the Ctrl, Alt, and Shift modifier keys when only one of each is necessary? Does low disk space affect SSD performance? I was wondering if having less than 5-10GB of free space on an SSD would affect performance. Is it specific to SSD or is it more of an operating system aspect?  For example, on an Intel X-25 G2 that has TRIM support (on Windows 7). How to not count blank pages in frontmatter of two-sided document I recently switched from my beloved MacBook Pro Retina (Late 2013) i5 2.6/16/512 to MacBook Pro (2017) Non-TB i5 2.3/16/512.  I purchased what from the build-quality looked like a good USB-C-to-DisplayPort cable with 4k/60Hz support, just to run into the very problem the Logicboard repair guru Louis Rossmann had described in : As soon as you plug in the USB-C dongle, the (2.4 GHz) Wifi stops working despite full antenna signal. Unplug the USB-C connector and you are immediately back in the game.  The big question I'm asking myself now: Who is to blame? Is this a design flaw in the current generation MacBooks with improper shielding or is it a design flaw in the various dongles?  I mean the fact that even Apple’s very own USB-C Digital AV Multiport Adapter is causing these WiFi issues (as you can learn from the many horrific ; but AFAIK have been fixed through a ), show that there’s something going horribly wrong. Block error on CMI I have two identical sites on Drupal 8 (A and B), on (A) I created a custom block(block/add), and then I export the configuration(drush config-export) and import this config on (B) (drush config-import), no error, but on the site (B) the block that I imported said on any region that I put "This block is broken or missing. You may be missing content or you might need to enable the original module." And I cant edit the content of this block. How I can fix that?  Site A:    Site B: Given two coprime integers, find multiples of them that differ by 1 I'll describe the problem with an example.  Find integers $n$ and $m$ such that $n\cdot13 + m\cdot101 = 1$. This is the same as solving the equation $n\cdot13 \equiv 1 \pmod {101}$  I'm revising for a maths exam in a few days and it seems like a lot of the questions and examples rely on an ability to solve this type of problem. I can't seem to find a method in my notes, the solutions just get plucked out of thin air! What is a neat way of doing it on pen and paper with a calculator? Direct "rate in iTunes" link in my app? Norm is sup of inner products (proof). Let $V$ be a vector space with an inner product $\langle.,. \rangle$ and associated norm $|| . ||$ Then:    Could I have a proof of this fact? Beamer: TOC only once before sections with subsections My presentation consist of multiple sections. Some sections consist of subsection and some not. I want beamer to display the TOC before every subsection and before every section which consists of no other subsection.  Currently, i write in the preamble:  \AtBeginSection[] {     \begin{frame}&lt;beamer&gt;     \frametitle{Inhalt} %     \tableofcontents[currentsection]       \end{frame} }  \AtBeginSubsection[] {     \begin{frame}&lt;beamer&gt;     \frametitle{Inhalt} %     \tableofcontents[currentsubsection]       \end{frame} }   As a result, if a section consist of subsecitons beamer displays the TOC twice before the first subsection in a section, one time for the section and one time for the subsection. That is ugly in my opinion. What can i do? Running Yosemite 10.0 with a clean erase and install, when I reboot, all my launchpad apps are totally disorganised, folders and un-official apps disappears...  After reorganizing the layout twice, I don't want to keep sorting my launchpad every time I restart my Mac. Game resource timers - general implementation I'm interested in understanding how resource generation timers work on many of the mmorts type games out there. I can't wrap my head exactly around how the timers are synched with servers, especially with multiple users. If I need to provide more details, please let me know.  Thanks! Let's say I have a class that has a member called data which is a list.    I want to be able to initialize the class with, for example, a filename (which contains data to initialize the list) or with an actual list.  What's your technique for doing this?  Do you just check the type by looking at __class__?  Is there some trick I might be missing?  I'm used to C++ where overloading by argument type is easy. \textcite macro produces "Author (year)" correctly but colours first paren with hyperref Yesterday, I've listened to a song called "Fear not this night". I find the syntax unusual (as a foreigner, I have never encountered it). Is it the same meaning as "Don't fear this night" ? What's the slight difference between these 2 ?  Thank you for your time. What are tag synonyms and merged tags? How do they work? What are tag synonyms? How can tag synonyms be distinguished from "real" tags? How are new tag synonyms created? Who can create tag synonyms? How can I delete/reverse/undo bad tag synonyms? What are merged tags? My input file is,  ami21 ami65 ami67 ami66 ami88 ami76 ami29 ami55  ami54 ami32   Using a single command line I need the output as,  ami22 ami66 ami68 ami67 ami89 ami77 ami30 ami56 ami55 ami33   I used the command  awk -vRS=ami '{$0=$0+1;ORS=RT}++n' inputfile &gt; outputfile   but I got the outputfile as ami21ami65ami67ami66ami88ami76ami29ami55ami54ami32  i.e. all strings are written in same line and without space. Could anyone suggext me some better command line. As Joel points out in , in  (aka: K &amp; R), there is mention of this property of arrays in C: a[5] == 5[a]  Joel says that it's because of pointer arithmetic but I still don't understand. Why does a[5] == 5[a]?