Kh. Hofmann et C. Terp, COMPACT SUBGROUPS OF LIE-GROUPS AND LOCALLY COMPACT-GROUPS, Proceedings of the American Mathematical Society, 120(2), 1994, pp. 623-634
We show that the set of compact subgroups in a connected Lie group is
inductive. In fact, a locally compact group G has the inductivity prop
erty for compact subgroups if and only if the factor group G/G0 modulo
the identity component has it.