Title | Extensions of Certain Partial Automorphisms of $\mathcal{L}^{\mathcal{ \ast }}(V_{\infty })$ |
Publication Type | Journal Article |
Year of Publication | 2009 |
Authors | Dimitrov R |
Journal | Annuaire de l’Université de Sofia “St. Kliment Ohridski”. Faculté de Mathématiques et Informatique |
Volume | 99 |
Abstract | The automorphisms of the lattice $\mathcal{L}(V_{\infty })$ have been completely characterized. However, the question about the number of automorphisms of the lattice $\mathcal{L}^{\mathcal{ \ast }}(V_{\infty })$ has been open for almost thirty years. We use some of our recent results about the structure of $\mathcal{L}^{\mathcal{ \ast }}(V_{\infty })$ to answer questions related to automorphisms of $\mathcal{L}^{\mathcal{ \ast }}(V_{\infty })$. We prove that any finite number of partial automorphisms of filters of closures of quasimaximal sets can be extended to an automorphism of $\mathcal{L}^{\mathcal{ \ast }}(V_{\infty })$. As a corollary we obtain that closures of quasimaximal sets of the same type are elements of the same orbit in $\mathcal{L}^{\mathcal{ \ast }}(V_{\infty })$. |
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