Timeline for Zariski-closed subgroups of ${\mathbf G}_{\mathbf a}^n$
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
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| Feb 21, 2016 at 1:46 | vote | accept | Drike | ||
| Feb 14, 2016 at 6:19 | comment | added | nfdc23 | @zeno: The proof in B.1 seems elementary and self-contained, especially if one runs it over a perfect field. Is that more complicated than the approach via k[F]-modules when one includes the work needed to set up the relationship to k[F]-modules? (Perhaps this is just a matter of taste.) | |
| Feb 13, 2016 at 18:40 | comment | added | zeno | Over a perfect field, the statement follows from the description of commutative algebraic groups with zero Verschiebung in terms of modules over k[F] (cf. Demazure Gabriel p.523). The treatment in CGP is more complicated because they are interested in imperfect base fields. | |
| Feb 13, 2016 at 16:00 | history | answered | nfdc23 | CC BY-SA 3.0 |