## Fuzzy Set Theory—and Its ApplicationsSince its inception, the theory of fuzzy sets has advanced in a variety of ways and in many disciplines. Applications of fuzzy technology can be found in artificial intelligence, computer science, control engineering, decision theory, expert systems, logic, management science, operations research, robotics, and others. Theoretical advances have been made in many directions. The primary goal of Fuzzy Set Theory - and its Applications, Fourth Edition is to provide a textbook for courses in fuzzy set theory, and a book that can be used as an introduction. To balance the character of a textbook with the dynamic nature of this research, many useful references have been added to develop a deeper understanding for the interested reader. Fuzzy Set Theory - and its Applications, Fourth Edition updates the research agenda with chapters on possibility theory, fuzzy logic and approximate reasoning, expert systems, fuzzy control, fuzzy data analysis, decision making and fuzzy set models in operations research. Chapters have been updated and extended exercises are included. |

### From inside the book

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Page iv

No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any

No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any

**means**, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher, ... Page xi

Input and output of the functional fuzzy c-

Input and output of the functional fuzzy c-

**means**. Structure of DataFngine. Screen shot of DataBngine. Cracking furnace. Furnace temperature. Fuzzy classification of continuous process. Application of DataFngine for acoustic quality ... Page xii

Predicted vs. observed data: Geometric

Predicted vs. observed data: Geometric

**mean**operator. Predicted vs. observed data: Y-operator. Concept hierarchy of creditworthiness together with individual weights d and g-values for each level of aggregation. Page 1

By crisp we

By crisp we

**mean**dichotomous, that is, yes-or-no-type rather than more-or-less type. In conventional dual logic, for instance, a statement can be true or false—and nothing in between. In set theory, an element can either belong to a set ... Page 2

... be guided by two considerations that are by no

... be guided by two considerations that are by no

**means**as important in the formal sciences: (a) The relationship between the language and the domain must be closer because they are in a sense produced through and for each other; ...### What people are saying - Write a review

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### Contents

9 | |

11 | |

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29 | |

Criteria for Selecting Appropriate Aggregation Operators | 43 |

The Extension Principle and Applications | 54 |

Special Extended Operations | 61 |

Applicationoriented Modeling of Uncertainty | 111 |

Linguistic Variables | 140 |

Fuzzy Data Bases and Queries | 265 |

Decision Making in Fuzzy Environments | 329 |

Applications of Fuzzy Sets in Engineering and Management | 371 |

Empirical Research in Fuzzy Set Theory | 443 |

Future Perspectives | 477 |

181 | 485 |

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### Common terms and phrases

aggregation algorithm analysis applications approach appropriate approximately areas assignment assume base called chapter classical clustering compute concepts considered constraints contains corresponding crisp criteria customers decision defined definition degree of membership depends described determine discussed distribution domain elements engineering example exist expert systems expressed extension Figure fuzzy control fuzzy numbers fuzzy set theory given goal human important indicate inference input instance integral interpreted intersection interval knowledge linguistic variable logic mathematical mean measure membership function methods normally objective objective function observed obtain operators optimal positive possible probability problem programming properties provides reasoning relation representing require respect rules scale shown shows similarity situation solution space specific statement structure suggested t-norms Table tion true truth uncertainty values Zadeh