[texhax] Meaning of Code frag

Philip TAYLOR (Ret'd) P.Taylor at Rhul.Ac.Uk
Sun Feb 22 16:59:44 CET 2009

As a non-mathematician, it looks more
to me as if it denotes the absolute
value (which cannot be negative).

P. R. Stanley wrote:
> Hi
> [start code]
> f(x)=O(g(x))\mbox{ as }x\to a
>   if and only if there exist positive numbers d and M such that
> |f(x)| \le \; M |g(x)|\mbox{ for }|x - a| < \delta.
> If g(x) is non-zero for values of x
> [end code]
> Is the | enclosing the functions used to denote order of growth?
> Cheers
> Paul
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