I've encountered lots of other 'ways' of expressing a sum that are different to

Sometimes people put , , , and sometimes they just put . What does this all mean?? Thanks!

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- December 29th 2007, 11:42 PM #1

- December 29th 2007, 11:53 PM #2

- December 30th 2007, 08:51 AM #3

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- December 30th 2007, 10:38 PM #4

- January 6th 2008, 01:11 PM #5
Well... I think that

... hope it's right

Also, there is a section on this in this link.

It is in 'A less than B' Chapter 2.2

http://www.mathhelpforum.com/math-he...ss-than-b.html

Thanks PaulRS for showing me the link, and of course Krizalid and ThePerfectHacker for posting the documents.