Mathematics – Representation Theory
Scientific paper
2012-04-25
Mathematics
Representation Theory
8 pages
Scientific paper
Given a linear order $\Omega$ its automorphism group $\Aut(\Omega)$ forms a lattice-ordered group via pointwise order. Assuming the continuum to be a regular cardinal, we show that \emph{pathological} and \emph{$\omega$-transitive} (i.e. highly transitive) representations of free groups abound within \emph{large} permutation groups of linear orders. Consequently, under the Generalized Continuum Hypothesis it is then true that given any linear order $\Omega$ for which $|\Omega| = $ cof$(\Omega) = \aleph_i$ ($i \in \N$) then any permutation group that is large in $\Aut(\Omega)$ contains an $\omega$-transitive representation of $G_{\aleph_{i}^+}$ (i.e. the free group of rank $2^{\aleph_i}$). In particular, and working solely within ZFC, we show that any large subgroup of $\Aut(\Q)$ (resp. $\Aut(\R)$) contains an $\omega$-transitive and pathological representation of any free group of rank $\lambda \in [\aleph_0,2^{\aleph_0}]$ (resp. of rank $2^{\aleph_0}$). Lastly, we also find a bound on the rank of free subgroups of certain restricted direct products.
No associations
LandOfFree
Omega-transitive Representation of Free Groups does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Omega-transitive Representation of Free Groups, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Omega-transitive Representation of Free Groups will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-137773