"In graph theory,..."

Maybe this is a borderline-case issue. If an article starts with "In geometry,..." or "In algebra,..." or "In calculus,..." or "In arithmetic,..." or "In algebraic geometry,..." or "In number theory,...", that tells the lay reader that mathematics is what the article is about.

But "In category theory,..." or "In functional analysis,..." does not convey that information, because non-mathematicians don't usually know what those are, and in fact "functional analysis" can mean something quite different in psychology from what it means in mathematics.

"In graph theory,..." seems to me less clear than the items in my first paragraph above, but maybe clearer than the ones in my second paragraph. I think I'll bring this up at Wikipedia talk:WikiProject Mathematics and ask for opinions. Michael Hardy (talk) 03:49, 22 July 2010 (UTC)[reply]

Permutation graph "representation"?

Hi Lyonsam, on the permutation graph page, you added the line "A permutation graph has a unique representation if and only if it is prime with respect to the split decomposition." I can't for the life of me figure out what a "representation" is. What do you mean by this term?

Vince Vatter (talk) 21:22, 20 October 2010 (UTC)[reply]

In the article, "representation" is meant in terms of permutation diagrams (note that, in the general case, a permutation graph could have many different permutation diagrams). I'll make a small edit that should make it a bit more clear.Lyonsam (talk) 00:25, 18 December 2010 (UTC)[reply]

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