en عمومى General پژوهشي Research paper <p>Abstract. In this paper we show that if G is a group acting on a tree X with inversions and if (T Y ) is a fundamental domain for the action of G on X, then there exist a group &tildeG and a tree &tildeX induced by (T Y ) such that &tildeG acts on &tildeX with inversions, G is isomorphic to &tilde G, and X is isomorphic to &tildeX. The pair (&tilde G &tildeX) is called the quasi universal cover of (GX) induced by the (T Y ).</p> Groups acting on trees with inversions, Fundamental domains,Quasi universal cover, Isomorphic trees. 39 45 http://ijmsi.ir/browse.php?a_code=A-10-1-54&slc_lang=en&sid=1 R. M. S. Mahmood 10031947532846002044 10031947532846002044 Yes