# what are the subgroups of an algebraic group with codimension one [closed]

let G be an algebraic group. which subgroups of G are codimension one subgroups.

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It is not quite clear what you are asking... The dimension of a closed subgroup depends on the closed subgroup, for example! The FAQ gives some information on how best to ask questions to attract useful answers. –  Mariano Suárez-Alvarez Jun 27 '11 at 19:53
@bernardshow: You should edit the question (click on the "edit" button), and certainly remove the "What is the dimension of $H$?" (unless you tell us what $H$ is). Your question will probably get closed, but if you edit it and make it into a clear question, then it might et reopened. –  André Henriques Jun 27 '11 at 20:19
İt is too late to edit. But you are right, my question is –  gauss Jun 28 '11 at 7:58

## closed as not a real question by Mariano Suárez-Alvarez♦, Igor Rivin, Simon Thomas, Martin Brandenburg, Qiaochu YuanJun 27 '11 at 22:49

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Let $\mathfrak g$ be a finite dimensional Lie algebra over a field of characteristic zero. If $\mathfrak h$ is a codimension one subalgebra then there exists a morphism $\phi : \mathfrak g \to > \mathfrak{sl}(2)$ with kernel contained in $\mathfrak h$.