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2h
comment Exacting footnote specifications
You can have a look to the bigfoot package.
2h
comment How to expand control sequence in argument of a macro
@IgorLiferenko An argument is either delimited or undelimited. You can't have both for the same parameter.
10h
comment Excessive spacing between lines in definition
\smash[b] in the top line although not in this case, where the space above the definition text compensates. It would be necessary if the first summation is in the second line. The “control space” before \in is wrong and \ldots should be \dots. You could first of all suggest the solution without \limits.
11h
comment Align equations in enumerate environment
@GustavoMezzetti There's no impact on memory usage, just on execution time, possibly a fraction of a nanosecond now, but not much more in the olden days. ;-)
11h
comment Odd (?) spacing for mapping notation
As I said, the shapes of symbols can create optical illusions or real clashes; for instance, one should type \sqrt{\,\log 3} because of the tall letter (clash) or x^2\!/2 to compensate for the hole created by the relative shapes (optical). Such details make a difference when good typography is concerned.
11h
comment File ended while scanning use of \NAT@palk
Welcome to TeX.SX!
11h
comment Odd (?) spacing for mapping notation
TeX adds \scriptspace after a sub/superscript, the default is 0.5pt (a bit less than 0.2mm). There is also the optical “hole” created by the shape of +, which is probably responsible for the seeming big space. If you really feel it's too wide, you can try with \!\to. But the third example has too big backspacing. The second one is just wrong, in my opinion.
11h
comment Align equations in enumerate environment
@GustavoMezzetti It's the same, just one expansion step less. When possible, I prefer higher level macros.
12h
comment Install a font local to one particular document
Converting TTF or OT fonts for pdflatex needs several steps and several files: you need TFM and VF files, ENC files and MAP files. Your aim is reachable in principle; but it requires expertise and time.
13h
comment Properly writing an enumerated list in different lines within a sentence
Don't be lazy with this: \\ for “leaving a blank line” is one of the worst errors.
14h
comment How to use \newenvironment; why doesn't this code work? How do I fix it?
@john.abraham Yes, with \captionof.
14h
comment Align equations in enumerate environment
@GustavoMezzetti Try that when \usepackage[greek]{babel} is loaded. ;-)
15h
comment inline uppercase chapter title
\MakeUppercase{\chaptertitlename}
15h
comment inline uppercase chapter title
Instead of {} try {\MakeUppercase}
15h
comment How to use \newenvironment; why doesn't this code work? How do I fix it?
@john.abraham You can't have floating objects inside a box. Note that you don't need \begin{figure} and \end{figure} around \includegraphics.
15h
comment pdfpages-PDF appears in background of pgfplots-plot
Very curious: it seems that \includepdf remembers forever to add the title page.
16h
comment How to get equal vertical spacing when one line has math
I was just thinking to that: if a line having maximum depth is followed by one having maximum height, there are chances the big objects will touch. On the other hand, I believe the problem is a false one: the baseline skip should be set once and for all.
16h
comment How to get equal vertical spacing when one line has math
What if there are two consecutive lines with excess height or depth and (by Murphy's law) the two big objects are above one another? The interline might not be uniform. You should probably add \lineskip to be sure and set \lineskiplimit to \maxdimen.
16h
comment How to split a long string in a variable?
Welcome to TeX.SX! Doing \expandafter\seqsplit\expandafter{\parametre} will do.
17h
comment LuaTeX: Wrong/missing italic correction in TeXLive 2015 vs 2014
@UlrikeFischer I think you got it!