sentences:  Although banned from academic positions due to Nazi policies, they were permitted to continue their research activities under the protection of Hermann Göring, who was more concerned with technical expertise than ideological purity.At DVL Flügge-Lotz began her career in automatic control theory and pioneered the theory of discontinuous control systems.These control systems, also known as "on-off" and "bang-bang" systems, have only two or three input settings and are simple to manufacture and very reliable in practical application.