%0 Journal Article %T Groups of outer type E6 with trivial Tits algebras %A Skip Garibaldi %A Holger P. Petersson %J Mathematics %D 2005 %I arXiv %R 10.1007/s00031-006-0051-2 %X In two 1966 papers, Jacques Tits gave a construction of exceptional Lie algebras (hence implicitly exceptional algebraic groups) and a classification of possible indexes of simple algebraic groups. For the special case of his construction that gives groups of type E6, we connect the two papers by answering the question: Given an Albert algebra A and a separable quadratic field extension K, what is the index of the resulting algebraic group? %U http://arxiv.org/abs/math/0511229v1