HoldForm and Sum
- To: mathgroup at smc.vnet.net
- Subject: [mg121769] HoldForm and Sum
- From: dimitris <dimmechan at yahoo.com>
- Date: Sat, 1 Oct 2011 03:07:48 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
Hell to all.
A (well-known) nice example of the use of HoldForm is:
Sum[(HoldForm[#1] & )[i], {i, 1, 10}]
(*output omited*)
I want to do the same with 1/i
Sum[(HoldForm[#1] & )[1/i], {i, 1, 10}]
Mathematica output is
1/10+1/9+1/8+...+1/3+1/2+1
My first question is how can I get the output in the form
1+1/2+1/3...+1/8+1/9+1/10
My second query comes now. How can I combine HoldForm and Sum (or
anything else) in order to have the following output (unevaluated)?
1+1/2+1/3-1/4-1/5-1/6+1/7+1/8+1/9-1/10-1/11-1/12
that is, three positive terms after three negative and so on.
Thank you in advance for your response.
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