# Time and Petri Nets

Textbook

1. Front Matter
Pages i-xi
2. Louchka Popova-Zeugmann
Pages 1-6
3. Louchka Popova-Zeugmann
Pages 7-30
4. Louchka Popova-Zeugmann
Pages 31-137
5. Louchka Popova-Zeugmann
Pages 139-172
6. Louchka Popova-Zeugmann
Pages 173-190
7. Back Matter
Pages 191-209

### Introduction

At first glance the concepts of time and of Petri nets are quite contrary: while time determines the occurrences of events in a system, classic Petri nets consider their causal relationships and they represent events as concurrent systems. But if we take a closer look at how time and causality are intertwined we realize that there are many possible ways in which time and Petri nets interact. This book takes a closer look at three time-dependent Petri nets: Time Petri nets, Timed Petri nets, and Petri nets with time windows.

The author first explains classic Petri nets and their fundamental properties. Then the pivotal contribution of the book is the introduction of different algorithms that allow us to analyze time-dependent Petri nets. For Time Petri nets, the author presents an algorithm that proves the behavioral equivalence of a net where time is designed once with real and once with natural numbers, so we can reduce the state space and consider the integer states exclusively. For Timed Petri nets, the author introduces two time-dependent state equations, providing a sufficient condition for the non-reachability of states, and she also defines a local transformation for converting these nets into Time Petri nets. Finally, she shows that Petri nets with time-windows have the ability to realize every transition sequence fired in the net omitting time restrictions.

These classes of time-dependent Petri nets show that time alone does not change the power of a Petri net, in fact time may or may not be used to force firing. For Time Petri nets and Timed Petri nets we can say that they are Turing-powerful, and thus more powerful than classic Petri nets, because there is a compulsion to fire at some point in time. By contrast, Petri nets with time-windows have no compulsion to fire, their expressiveness power is less than that of Turing-machines.

This book derives from advanced lectures, and the text is supported throughout with examples and exercises. It is suitable for graduate courses in computer science, mathematics, engineering, and related disciplines, and as a reference for researchers.

### Keywords

Discrete analyzing algorithms Petri nets State equations Time Petri nets Time-dependent Petri nets Timed Petri nets

#### Authors and affiliations

1. 1.Institut für InformatikHumboldt-Universität zu BerlinBerlinGermany

### Bibliographic information

• Book Title Time and Petri Nets
• Authors Louchka Popova-Zeugmann
• DOI https://doi.org/10.1007/978-3-642-41115-1
• Copyright Information Springer-Verlag Berlin Heidelberg 2013
• Publisher Name Springer, Berlin, Heidelberg
• eBook Packages Computer Science Computer Science (R0)
• Hardcover ISBN 978-3-642-41114-4
• Softcover ISBN 978-3-662-51435-1
• eBook ISBN 978-3-642-41115-1
• Edition Number 1
• Number of Pages XI, 209
• Number of Illustrations 54 b/w illustrations, 6 illustrations in colour
• Topics
• Buy this book on publisher's site
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