---
title: "On the Semantics of Knowledge Update"
authors:
  - "Chitta Baral"
  - "Yan Zhang"
doi: ""
url: "https://ijcai.org/proceedings/2001/13"
pdf: "https://ijcai.org/proceedings/2001/0013.pdf"
venue: "Proceedings of the Seventeenth International Joint Conference on Artificial Intelligence"
year: 2001
pages: "97-101"
track: ""
keywords:
---

# On the Semantics of Knowledge Update

Chitta Baral, Yan Zhang

*Proceedings of the Seventeenth International Joint Conference on Artificial Intelligence*, pages 97-101.

## Abstract

We consider the problem of how an agent’s knowledge can be updated. We propose a formal method of knowledge update on the basis of the semantics of modal logic S5. In our method, an update is specified according to the minimal change on both the agent’s actual world and knowledge. We then investigate the semantics of knowledge update and characterize several specific forms of knowledge update which have important applications in reasoning about change of agents’ knowledge. We also discuss the persistence property of knowledge and ignorance associated with knowledge update.