# Preprint: Marginal and Conditional Second Laws of Thermodynamics

Gavin E. Crooks, Susanne Still, arXiv:1611.04628

## Abstract

We consider the entropy production of a strongly coupled bipartite system. The total entropy production can be partitioned into various components, which we use to define local versions of the Second Law that are valid without the usual idealizations. The key insight is that the joint trajectory probability of interacting systems can be split into terms representing the dynamics of the individual systems without feedback.