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05654486 Talpo, Humberto Luiz Firer, Marcelo Automorphism groups of semi-homogeneous trees. Giambruno, Antonio (ed.) et al., Groups, rings and group rings. International conference, Ubatuba, Brazil, July 28--August 2, 2008. Providence, RI: American Mathematical Society (AMS) (ISBN 978-0-8218-4771-8/pbk). Contemporary Mathematics 499, 265-270 (2009). 2009 Providence, RI: American Mathematical Society (AMS) EN semi-homogeneous trees automorphism groups complete groups ambivalent groups Summary: We prove that automorphism groups of semi-homogeneous trees are complete and ambivalent.