3.45.2 Greatest hits from previous weeks

Greatest hits from previous weeks:

3.45.2.1 How to add an extra level of sections with headings below \subsubsection

https://tex.stackexchange.com/questions/60209/how-to-add-an-extra-level-of-sections-with-headings-below-subsubsection

I have a document which requires many levels of sectioning. I have sections, subsections and subsubsections, but require one more level below that. I can't change the sections to be parts and move  ...
 

- asked by robintw (171 votes), answered by Gonzalo Medina (144 votes)

3.45.2.2 Matrix in Latex

https://tex.stackexchange.com/questions/204621/matrix-in-latex

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] 
...
 

- asked by Lakshmi Narayanan (67 votes), answered by skpblack (105 votes)