# User talk:Ringspectrum

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## Ring (mathematics)

You might want to have a look at the article. :) --PST 16:58, 18 January 2009 (UTC)

Why? Ringspectrum (talk) 17:03, 18 January 2009 (UTC)
"Ring" and "Spectrum" are both concepts in ring theory and ring theory studies rings. --PST 17:34, 18 January 2009 (UTC)
A "ring spectrum" is an object in homotopy theory ;-) Ringspectrum (talk) 17:36, 18 January 2009 (UTC)

## MOSMATH

• In non-TeX mathematical notation, variables should be italicized but digits and punctuation should not (this matches TeX style);
• In non-TeX notation, a minus sign is not a stubby little hyphen;
• A space should precede and follow "+", "=", etc. With binary operators I normally make these non-breakable.

Thus

• "(n + 1)-dimensional space" is correct, but
• "(n+1)-dimensional space" is incorrect.

And so on. Michael Hardy (talk) 05:00, 21 January 2009 (UTC)

Also note that you would write Rn instead of Rn and f(x) instead of f(x) (please edit this page to see the difference). --PST 08:05, 21 January 2009 (UTC)
There are some problems with nbsp on Valuation ring Ringspectrum (talk) 11:16, 21 January 2009 (UTC)

Except that I'd italicize the n, thus: Rn. Michael Hardy (talk) 18:08, 21 January 2009 (UTC)

...and although certainly f(x), with the parentheses italicized, is incorrect and f(x) is OK, I prefer using fnof, thus ƒ(x). That looks more like what TeX would give you. Michael Hardy (talk) 18:09, 21 January 2009 (UTC)

Should one use whitespaces/nbsp for terms in exponents? Ringspectrum (talk) 18:19, 21 January 2009 (UTC)
Well, I would write xn rather than xn (which is incorrect). But it any case, LaTeX beats TeX any day :) - thus, ${\displaystyle x^{n}}$ --PST 04:00, 6 March 2009 (UTC)

## Prosolvable Groups

Hi Ringspectrum,

thank you for your contribution on prosolvable groups. Of course you are right, what I had written was not completely true. However, I undid your edit and corrected my old version of the article. Now the article should be better. (I apologize for any mistakes in my English grammar; English is not my mother tongue.)

Thanks a lot, ElNuevoEinstein--ElNuevoEinstein (talk) 21:31, 26 August 2009 (UTC)

Hi ElNuevoEinstein,
I think it is wrong now: 1) The ramification group need not be abelian.
2) Why is the inertia group the semidirect product of the ramification group with Q? Ok, this should hold since (|R|, |I/R|) = 1
3) There are parentheses missing in the semidirect product.
Ringspectrum (talk) 06:03, 27 August 2009 (UTC)
Hi Ringspectrum
1) OK, you are right. It is not abelian, but of p-power order (and therefore solvable).
2) R is the unique Sylow p-subgroup of I and is therefore a normal subgroup.
3) I fixed it. --ElNuevoEinstein (talk) 15:58, 27 August 2009 (UTC)
Hi ElNuevoEinstein,
2) Yes, it is normal, but this doesn't already imply that it splits as a semidirect product. You need further that the factor group has order prime to p. Ringspectrum (talk) 16:28, 27 August 2009 (UTC)

## Nomination for deletion of Template:EGA I

Template:EGA I has been nominated for deletion. You are invited to comment on the discussion at the template's entry on the Templates for discussion page. Thank you. Magioladitis (talk) 16:03, 15 January 2010 (UTC)

## Springer?

Hi!

I noticed you added a reference "See exercise 2.4.15 of Springer", but I wasn't able to determine which "Springer" since there are various references from Springer books...

Do you remeber wich one is being cited? Helder (talk) 19:35, 5 May 2010 (UTC)

Springer, Linear algebraic groups. Ringspectrum (talk) 09:09, 7 May 2010 (UTC)

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## ArbCom elections are now open!

Hi,
You appear to be eligible to vote in the current Arbitration Committee election. The Arbitration Committee is the panel of editors responsible for conducting the Wikipedia arbitration process. It has the authority to enact binding solutions for disputes between editors, primarily related to serious behavioural issues that the community has been unable to resolve. This includes the ability to impose site bans, topic bans, editing restrictions, and other measures needed to maintain our editing environment. The arbitration policy describes the Committee's roles and responsibilities in greater detail. If you wish to participate, you are welcome to review the candidates' statements and submit your choices on the voting page. For the Election committee, MediaWiki message delivery (talk) 14:10, 24 November 2015 (UTC)