---
title: "Things That Change by Themselves"
authors:
  - "Vladimir Lifschitz"
  - "Arkady Rabinov"
doi: ""
url: "https://ijcai.org/proceedings/1989/138"
pdf: "https://ijcai.org/proceedings/1989/0138.pdf"
venue: "Proceedings of the Eleventh International Joint Conference on Artificial Intelligence"
year: 1989
pages: "864-866"
track: "Planning, Scheduling, Reasoning About Actions"
keywords:
---

# Things That Change by Themselves

Vladimir Lifschitz, Arkady Rabinov

*Proceedings of the Eleventh International Joint Conference on Artificial Intelligence*, pages 864-866.

## Abstract

Some fluents (for instance, time) change even after events that are not assumed to affect them (such as the action wait). We propose a formalization of the "commonsense law of inertia" in the situation calculus that allows us to describe such fluents.