Chapter 6

Indirect Effects of Events

Abstract

Suppose that a book is sitting on a table in a living room, and an agent is in the living room. Normally, when the agent walks out of the room, the book remains in the living room; but, if the agent picks up the book and walks out of the living room, then the book is no longer in the living room. That is, an indirect effect or ramification of the agent walking out of the living room is that the book the agent is holding changes location. The problem of representing and reasoning about the indirect effects of events is known as the ramification problem. We present several methods for representing indirect effects and dealing with the ramification problem in the event calculus. We discuss the use ...

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