High Quality Content by WIKIPEDIA articles! "An Exceptionally Simple Theory of Everything" is a preprint proposing a basis for a unified field theory, very often referred to as "E8 Theory," which attempts to describe all known fundamental interactions in physics and to stand as a possible theory of everything. The paper was posted to the physics arXiv by Antony Garrett Lisi on November 6, 2007, and was not submitted to a peer-reviewed scientific journal. The title is a pun on the algebra used, the Lie algebra of the largest "simple," "exceptional" Lie group, E8. Using representation theory, the paper describes how the combined structure of all gravitational and Standard Model forces acting on a generation of fermions is part of the E8 Lie algebra. In the paper, Lisi states that all three generations of fermions do not directly embed in E8 with correct quantum numbers, but might be described via a triality transformation, noting that the theory is incomplete.