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 Yearling
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comment Removing the trailing period when referencing a section number
The trailing period is introduced right at the beginning with \renewcommand{\thesection}{\Roman{section}.} If you alter that definition, it will go, although it will remove the period in the headings as well, so you will have to make other changes to put it back. Imvho those changes at the start weren't the best approach. It's a little bit difficult to completely answer this question, I think, without knowing precisely what you want.
1d
answered Undefined control sequence. …\infty} F{_i} \right ) = \sum_{i=1}^{\infy Underfull \hbox (badness 10000) in paragraph Command \' invalid in math mode
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awarded  Yearling
2d
comment font designating integer, rational, real, or complex
Welcome to TeX.SX. Merlin has given you the answer down below - but just to give you a bit of info, this style is referred to as "blackboard bold" and not everybody is a fan. The idea behind blackboard bold is that it's how bold letters can be written on a blackboard. In other words, these are sometimes still (and originally always were) just plain old bold letters and when they were written on a blackboard, they were double-struck to mimic the emboldening. So you can (and people do) just use bold as well. en.wikipedia.org/wiki/Blackboard_bold
Jul
25
comment Missing $ inserted as error message, but it's not that
Welcome to TeX.SE! I'm afraid we're probably gonna need a bit more information than this to be able to help you. You should try and construct an MWE (meta.tex.stackexchange.com/questions/228/…). "I copied all of my document into another template" - I'm not really sure what you mean by that, but it seems like the problem may be in your preamble. Maybe you've loaded some funky packages or something?
Jul
20
comment Text is spilling over the margin with standard margin settings
Could you provide us with an MWE please, so that we can have your text. That way, we won't have to construct some text with a line ending in 'eye-movement' ourselves. As you can imagine, that will save a lot of tedious messing about and make your question much more attractive to us to answer
Jul
16
comment How to make another kappa
æ is definitely used in phonetics. It's the IPA representation of the vowel in cat (in most peoples' accents, anyway, English has so many accents, I don't think you'll ever find a vowel that's pronounced the same by everyone)
Jul
16
comment How to make another kappa
A very fine answer, apart from one tiny point of pedantry. AFAIK æ isn't really a French letter. It gets used in Latin and Greek borrowings, but then it did in English too. And still does, very occasionally. Encyclopædia Britannica being the go-to example :P
Jul
16
comment undefined control sequence for integral
you really need to ask a new question and provide a full Minimum Working Example. It seems likely to me, given the error message you have reproduced there, that you are having problems downstream and the \oiint problem has been solved. N.B. my other little tidbits about normal vectors and typesetting differentials were just that: tidbits. They shouldn't affect anything else, although I can't imagine any way that \hat{nmath} could give you a nice result! :P
Jul
16
comment How big of a file is too big for LaTex?
I've never really boldly gone where no LaTeX-er has gone before; but the only thing I've ever had to sit and wait for is a large (about 400 slides I think) beamer presentation, compiling with xelatex (took about 30 seconds I think)
Jul
15
comment undefined control sequence for integral
Are you looking for \hat{\mathbf{n}}, that seems more standard: mathworld.wolfram.com/NormalVector.html. It's good to include a \, or sometimes people use \; You want a small space
Jul
15
comment undefined control sequence for integral
Are you definitely loading a package that provides \oiint. I think you need esint for that. Also what are you hoping for with \hat{nmath}? A final PS, you generally want a small space before your differential, thus: \, dS
Jul
14
comment How to make a nasalized schwa [ə͂] in textipa?
Ooooh, sorry I was a bit late, didn't notice Alan Munn had already jsut about said it all!
Jul
14
answered How to make a nasalized schwa [ə͂] in textipa?
Jul
13
revised I'm trying to bold this set of code: $T^{-1}(x)$=$\frac{9}{5}$x+32
added 1258 characters in body
Jul
13
comment I'm trying to bold this set of code: $T^{-1}(x)$=$\frac{9}{5}$x+32
@Mico Good comment, I was going off of Lamport's User's Guide and Reference Manual. He has an entry for vertical mode in the index, but I can't find it in the text. Is vertical mode a LaTeX mode or a TeX mode? I've got a feeling Lamport mentions it. Anyway, your succinct summary is better than mine, I'll edit
Jul
13
revised I'm trying to bold this set of code: $T^{-1}(x)$=$\frac{9}{5}$x+32
added 693 characters in body
Jul
13
comment I'm trying to bold this set of code: $T^{-1}(x)$=$\frac{9}{5}$x+32
Good point, @GustavoMezzetti, give me two shakes of a lamb's tail. Well, maybe five?
Jul
13
revised I'm trying to bold this set of code: $T^{-1}(x)$=$\frac{9}{5}$x+32
added 593 characters in body
Jul
13
answered I'm trying to bold this set of code: $T^{-1}(x)$=$\frac{9}{5}$x+32