A generalisation of Feit-Seitz s theorem

‎In 1988‎, ‎Feit and Seitz studied composition factors of rational groups and determined all possible rational finite simple groups‎. ‎They prove that such a simple group is isomorphic to $\PSp_{6}(2)$ or $\PO_{8}^{+}(2)$‎. ‎The main aim of this talk is to generalise this result to semi-rational groups