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I was looking at this paper - are there any easier references that go through the proof of Freudenthal suspension theorem? I need to use this to prove something about spheres. My lecturer was saying there is a special case that only deals with spheres.


Also, I was wondering, how does the author LaTeX

$$ (f+g)(x_1,x_2,x_3,\ldots,x_n)= \begin{cases} f(2x_1,x_2,\ldots,x_n)&\text{if } 0 \leq x_1 \leq \frac{1}{2},\\ g(1-2x_1,x_2,\ldots,x_n)& \text{if }\frac{1}{2} \leq x_1 \leq 1 \end{cases} $$

so that it looks like the document.

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    @t.b. Thanks, but that doesn't work in texworks. So I'm sort of stuck.2012-04-07
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    You need to use `\usepackage{amsmath}` in the preamble (before `\begin{document}`) I'm pretty sure texworks ships with amstex, so that's the only modification you need has that included. Here's [the documentation](ftp://ftp.ams.org/ams/doc/amsmath/amsldoc.pdf).2012-04-07
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    Thanks t.b. that actually solved it.2012-04-07
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    DO NOT WRITE "...". Write "\ldots". They won't look the same in the document; the former won't have proper spacing.2012-04-07
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    LaTeX questions should be asked at tex.stackexchange.com.2012-04-07
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    Unfortunately I cannot down-vote t.b.'s comment.2012-04-07
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    @MichaelHardy: I'm sorry about that. This was a result of copy-paste from the original source (and the question was about the cases environment, not the ellipses). I removed the comment in order not to spread this wrongdoing...2012-04-07
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    @MichaelHardy You could start a meta thread tagged feature-request about down voting comments. I'll upvote if you do that.2012-04-07
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    I re-tagged the question, since it is also asking for a more comprehensible source for the theorem2012-04-07

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