/*
   This is a third test of the |HWEB| system of documentation.
   The compiler ought to produce some nice HTML code for
   this example as well.

   (All examples are (C) 2004 Arthur O'Dwyer, not that it matters.)
   $f(C)$ and /f(C)/ and |f(C)| behave as expected, right?

   What? Are question marks not behaving properly?!  ??? What is
   wrong with them!?!  ?? Two ??? Three ? One  None

   $\not\in$  $\not$  $\note$

   Let's play with entities!  It should work if we state that
   $\exists(x,y,z): x^2 + y^2 = z^2$, or that $\forall n\in N:
   \exists n'\in N: n' = n+1$.  Something like that.
   $
      mySum := \sum_i xi* yi
      \Phi\sim mySum
      \Phi\sim{}mySum
   $
   That's all, folks!
*/