Abelian Groups with Modular Generic
Loveys, James
J. Symbolic Logic, Tome 56 (1991) no. 1, p. 250-259 / Harvested from Project Euclid
Let $G$ be a stable abelian group with regular modular generic. We show that either 1. there is a definable nongeneric $K \leq G$ such that $G/K$ has definable connected component and so strongly regular generics, or 2. distinct elements of the division ring yielding the dependence relation are represented by subgroups of $G \times G$ realizing distinct strong types (when regarded as elements of $G^{eq}$). In the latter case one can choose almost 0-definable subgroups representing the elements of the division ring. We find a bound $((G : G^0))$ for the size of the division ring in case $G$ has no definable subgroup $K$ so that $G/K$ is infinite with definable connected component. We show in case (2) that the group $G/H$, where $H$ consists of all nongeneric points of $G$, inherits a weakly minimal group structure from $G$ naturally, and $\mathrm{Th}(G/H)$ is independent of the particular model $G$ as long as $G/H$ is infinite.
Publié le : 1991-03-14
Classification: 
@article{1183743564,
     author = {Loveys, James},
     title = {Abelian Groups with Modular Generic},
     journal = {J. Symbolic Logic},
     volume = {56},
     number = {1},
     year = {1991},
     pages = { 250-259},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1183743564}
}
Loveys, James. Abelian Groups with Modular Generic. J. Symbolic Logic, Tome 56 (1991) no. 1, pp.  250-259. http://gdmltest.u-ga.fr/item/1183743564/