“…We will also suppose that G has a simply connected complexification G C . Finally we can assume, with no loss of generality, that M is connected, because in case I, M always is ( [14, 7.12.7]), and in case II, if M is disconnected, then G must be a direct product of SL(2, R) with a compact group, and the results of this paper are easily deduced from [5] and [4].…”