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To get all the special effects, a {\tt .tex} files is filled with
command symbols, like the ones that generated the accents, or 
command words, like the ones that manipulated the page size.  The
latter have be be ended by a non-letter --- which is why \TeX\ needs
the backslash-space after it, because otherwise there would have been 
no space before Archive.

And to get all the fancy math symbols, the \LaTeX\ compiler must go
into ``math mode'', which I do with a dollar sign \$, but that is a 
leftover from \TeX --- \LaTeX\ has two other methods.  If I want to
put the formulas in the center of the page, with a little space 
above and below, I use \$\$ to put the compiler into ``display math
mode''.  (To get out of these modes and back into ``text mode'', I 
give the same command again.) In these modes, the letters look a 
little ``italic'' ---
they have a slight slant; to get normal-looking letters in math
mode, I have to put them in a group, separated with braces \{ and \},
that starts with backslash-rm.  Also, whatever spacing I might
type is essentially ignored by the compiler --- if I want specific
spacing, I have to specify it, with normal spaces (backslash-space),
small spaces (like between $x$ and $dx$ in $\int x\,dx$, done by 
backslash-comma), big spaces (backslash-quad --- this is a command
word, not a command symbol) and huge spaces (backslash-qquad).

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