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Useful notes for some of my answers:

CTAN lion drawing by Duane Bibby.

How do you accept an answer?](http://meta.tex.stackexchange.com/q/1852/3954)

minimal working example](http://www.minimalbeispiel.de/mini-en.html)

The demo option for graphicx simply replaces actual figures with black rectangles; do not use that option in your actual document.


10h
comment \renewcommand not working for subsection
@Sigur no; there are no additional commands; the document class used is IEEtran which produces those headings by default.
10h
revised \renewcommand not working for subsection
added 1 character in body
10h
revised add (a little bit long) comment on the equal sign?
code formatting, added tag
10h
comment add (a little bit long) comment on the equal sign?
The best thing to do here is not to do that; surely there's a better way to indicate what you want to express than overloading the equality symbol.
10h
comment \renewcommand not working for subsection
No, this won't work since the document class used by the OP is IEEEtran with no options which uses a different set of commands for the representations of the counters.
10h
answered \renewcommand not working for subsection
17h
answered Debugging Friggeri's CV - Underfull \hbox (badness 10000)
17h
comment Background image used for a whole section/chapter at once
@ThomasE. please see my updated answer; the second code (the one with no companion image) shows how to add the material to two different sections.
17h
revised Background image used for a whole section/chapter at once
added 939 characters in body
17h
comment Background image used for a whole section/chapter at once
Sure! You can nest two such "if"s. Give me some minutes and I'll expand my example.
18h
revised Background image used for a whole section/chapter at once
added 29 characters in body
18h
comment Background image used for a whole section/chapter at once
@ThomasE. Yes. See in my code, for example, that where section three begins, there is no background image although there is still some text from section two; in that page you might still want to add the material but you will have to do it manually. For chapters there is no need for those manual adjustments.
18h
comment Background image used for a whole section/chapter at once
@Werner Agreed. I added some remark about this to my answer.
18h
revised Background image used for a whole section/chapter at once
added 128 characters in body
18h
comment Background image used for a whole section/chapter at once
Ah, I see what you mean now. The ideal situation is to add/suppress the background material aftera \clearpage (for chapters, for example): in other cases, some manual adjustments might be needed.
18h
comment Background image used for a whole section/chapter at once
@Werner why not?
18h
answered Background image used for a whole section/chapter at once
18h
comment How to fix this problem with tikz knots and decorations?
An ugly hack is to first draw the knot path and the use a path just for the decoration: \draw[knot=black] (0,0) -- (1,0); \path[decoration={markings, mark=at position 0.5 with {\arrow{>}}},decorate] (0,0) -- (1,0);
18h
comment How to fix this problem with tikz knots and decorations?
Ah, yes; you're right. Not the path interrupts the arrow. Forget my previous comment.
19h
comment How to fix this problem with tikz knots and decorations?
This seems to work for your MWE, but I am not sure if it will be a solution in more complicated situations: \draw[knot=black,decoration={markings, mark=at position 0.5 with {\arrow{>}}},preaction=decorate] (0,0) -- (1,0);