Die gefestigte Rechtsposition als Maßstab des Rückwirkungsverbots.

»The Established Legal Position as a Benchmark for the Prohibition of Retroactivity«: The dissertation examines for the first time how, based on the three groundbreaking decisions of the Federal Constitutional Court of 7 July 2010 on retroactivity in tax law, a prohibition of retroactivity that can be generalized for all areas of law can be established on the basis of the established legal position. The work is complemented by studies on the subject of law and time, as well as the question of how legal positions develop over time.