Chapter 2

The Event Calculus

Abstract

We present the foundations of the event calculus, a formalism for commonsense reasoning. We review first-order logic and describe some notational conventions. We discuss the basics of the event calculus, and we present two axiomatizations of the event calculus: EC and DEC. We discuss how to choose which axiomatization to use. We present reification, which is needed to represent statements about events and fluents in first-order logic. We discuss unique names axioms, conditions, circumscription, and domain descriptions, and we describe the types of reasoning that can be performed using the event calculus.

Keywords

Commonsense reasoning

Reasoning about action and change

Knowledge representation

Eevent calculus ...

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