---
title: "A Modification of the Halpern-Pearl Definition of Causality"
authors:
  - "Joseph Y. Halpern"
doi: ""
url: "https://ijcai.org/proceedings/2015/427"
pdf: "https://ijcai.org/proceedings/2015/0427.pdf"
venue: "Proceedings of the Twenty-Fourth International Joint Conference on Artificial Intelligence"
year: 2015
pages: "3022-3032"
track: "Special Track on Knowledge Representation and Reasoning"
keywords:
---

# A Modification of the Halpern-Pearl Definition of Causality

Joseph Y. Halpern

*Proceedings of the Twenty-Fourth International Joint Conference on Artificial Intelligence*, pages 3022-3032.

## Abstract

The original Halpern-Pearl definition of causality was updated in the journal version of the paper to deal with some problems pointed out by Hopkins and Pearl. Here the definition is modified yet again, in a way that (a) leads to a simpler definition, (b) handles the problems pointed out by Hopkins and Pearl, and many others, (c) gives reasonable answers (that agree with those of the original and updated definition) in the standard problematic examples of causality, and (d) has lower complexity than either the original or updated definitions.