RT - Journal Article T1 - ON QUASI UNIVERSAL COVERS FOR GROUPS ACTING ON TREES WITH INVERSIONS JF - IJMSI YR - 2007 JO - IJMSI VO - 2 IS - 1 UR - http://ijmsi.ir/article-1-56-en.html SP - 39 EP - 45 K1 - Groups acting on trees with inversions K1 - Fundamental domains K1 - Quasi universal cover K1 - Isomorphic trees. AB - 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 ). LA eng UL http://ijmsi.ir/article-1-56-en.html M3 10.7508/ijmsi.2007.01.004 ER -