title: Quasi-split group
text: # Quasi-split group
  
  In mathematics, a quasi-split group over a field is a reductive group with a Borel subgroup defined over the field. Simply connected quasi-split groups over a field correspond to actions of the absolute Galois group on a Dynkin diagram.
  
  ## Examples
  
  All split groups (those with a split maximal torus) are quasi-split. These correspond to quasi-split groups where the action of the Galois group on the Dynkin diagram is trivial.
  
  Lang (1956) showed that all simple algebraic groups over finite fields are quasi-split.
  
  Over the real numbers, the quasi-split groups include the split groups and the complex groups, together with the orthogonal groups $O_{n,n+2},$ the unitary groups $SU_{n,n}$ and $SU_{n,n+1},$ and the form of $E_6$ with signature 2.
  
  