
Re: Unusual notation
Posted:
Mar 4, 2011 8:34 PM


On Fri, 04 Mar 2011 13:13:23 0500, David Bernier <david250@videotron.ca> wrote in <news:ikra4906sr@news1.newsguy.com> in alt.math.undergrad,sci.math:
[...]
> I'm wondering if you might have this edition: > "New Age International, 1982  379 pages" as shown here: > < http://books.google.com/books?id=FyybL1ma4twC > .
> I do seem to remember a notation quite similar to this:
> > > n >____
> (page 82, 3.3 Solved Problems, Example 3).
> I'm pretty sure I saw it earlier in the book. If it's a > match (around page 82), you might look earlier in the > book, e.g. Example 9, page 63:
> "Show that for any number x, lim x^n / (_ (n) ) = 0.
> [Solution]
> Let a_n = x^n / (_ (n) ) .
> (therefore) a_{n+1}/a_n = x^{n+1}/(_ (n+1) ) * (_ (n) ) / x_n
I'm pretty sure that that last should be x^n, not x_n.
> = x/(n+1) [etc.] "
Here it's clearly the factorial: [x^(n+1)/(n+1)!] * n!/x^n = x/(n+1).
[...]
Brian

