Talk:Irregularity of a surface

First Betti number[edit]

It may be helpful to specify the relation of q to the first Betti number. Tkuvho (talk) 19:27, 9 February 2011 (UTC)[reply]

"Regular surface" redirect[edit]

"Regular surface" redirects here. In the differential geometry class I'm currently taking, "regular surface" is used to mean a smooth manifold of dimension 2 in $\mathbb {R} ^{n}$ . I'm not sure how this concept is related to the topic of this article. Could someone explain the relationship between these two subjects? Otherwise, I think the redirect page should be deleted. Augurar (talk) 03:06, 14 November 2011 (UTC)[reply]

I agree: in algebraic geometry regular is frequently used as the opposite of "singular", and thus as a synonym of "non-singular" or "smooth". D.Lazard (talk) 14:59, 7 April 2012 (UTC)[reply]