Muschik, Wolfgang2018-11-092018-11-0919980340-0204https://depositonce.tu-berlin.de/handle/11303/8452http://dx.doi.org/10.14279/depositonce-7598Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.According to M. Eigen there are two reasons for irreversibility: weak and strict temporality. Measures for irreversibility are defined by different formulations of the 2nd law which can be divided into two classes: the more general in time integrated formulations as Clausius' inequality and the more special in time local formulations as the non-negativity of the entropy production density. The logical relations between eight different formulations of the 2nd law are investigated and discussed.en530 PhysikArticle1437-4358