# Talk:Group (mathematics)

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**Talk:Group (mathematics)**as edited by BRichtigen (Talk | contribs) at 13:04, 17 November 2008. This URL is a permanent link to this version of this page.The example in the text is not the Klein four group. All elements of the Klein four group (except the identity) have order 2. But *i* in the example has order 4. Beetbeet 14:27, 11 June 2007 (EDT)

- Thank you. Please make your correction yourself. That's what this software is for. Godspeed.--Aschlafly 14:38, 11 June 2007 (EDT)
- Ok, I made the correction. Beetbeet 15:56, 11 June 2007 (EDT)

IMO, it's important to give the most basic examples, first. What's about a group of matrices as an example of a non-abelian groub? Or would be better? DiEb 11:06, 2 August 2008 (EDT)

It doesn't make sense to speak of a positive root of x^2 + 1 = 0... --BRichtigen 12:05, 17 November 2008 (EST)

- You can't just say "the" square root of -1; there are two. The positive square root is +i, as opposed to -i. -CSGuy 12:22, 17 November 2008 (EST)

- Of course, there are two. You choose
*a*root of x^2 +1 = 0.But what does make the one positive, the other negative? Only because you named one*i*- arbitrarily, the other becomes its negative :-) - --BRichtigen 14:04, 17 November 2008 (EST)

- Of course, there are two. You choose