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From: REjmdk1964@MOxs4allVE.nl (Johan de Koning)
Newsgroups: alt.ascii-art
Subject: Re: ASCII math
Date: Fri, 29 May 2009 03:59:35 GMT
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On Mon, 18 May 2009 02:41:06 +0000, Johann `Myrkraverk' Oskarsson wrote:

> Hi all,
> 
> For the few of you that enjoy something like this.
>
>         n
>       .----
>        \        n(n + 1)
>         >   i = --------
>        /           2
>       '----
>        i=1

Proof by squarisation:
 _ _ _ _ _             _       _ _ _ _ _ _
|_|_|_|_|_|          _|_|     |_|_|_|_|_|_|
|_|_|_|_|          _|_|_|     |_|_|_|_|_|_|
|_|_|_|     +    _|_|_|_|  =  |_|_|_|_|_|_|  =  5 x 6
|_|_|          _|_|_|_|_|     |_|_|_|_|_|_| 
|_|           |_|_|_|_|_|     |_|_|_|_|_|_| 

 5+4+3+2+1  +  1+2+3+4+5   =   5+5+5+5+5+5   =  30

Replace 5 by n, for large values of 5. :-)