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.