...c germs). For (2), classical Lie group theory, and techniques newly developed by Kath, Olbrich, Neukirchner (twofold extensions...). For (3), (G,X)-structures... I wish to work on those subjects with Helga Baums team in Berlin, Humboldt Universitat. The idea is that we have close interests, but with different, complementary approaches and competencies.That is why: - this transnational cooperation ...