Hahn, Heekyoung
Article History
Received: 18 February 2016
Accepted: 5 July 2016
First Online: 3 October 2016
Acknowledgements
: The author is grateful to L. Saper for answering various questions on representation theory and J. R. Getz for his constant support throughout this project and help with editing of the paper. The author also thanks to anonymous referees for useful comments and pointing out the Littlewood–Richardson semigroup and its saturation property.