## 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

Results 1-5 of 72

Page viii

... on Aggregators 463 16.4 Conclusions 474 17 Future Perspectives 477 Abbreviations of Frequently Cited Journals 481 Bibliography 483 Index 507 Figure 1-1

... on Aggregators 463 16.4 Conclusions 474 17 Future Perspectives 477 Abbreviations of Frequently Cited Journals 481 Bibliography 483 Index 507 Figure 1-1

**Concept**hierarchy of creditworthiness . Figure 2-1 Real viii CONTENTS. Page xii

... y - operator . 473 474 Figure 16-16

... y - operator . 473 474 Figure 16-16

**Concept**hierarchy of creditworthiness together with individual weights d and g - values for each level of aggregation . 475 Table 3-1 operators . Table 3-2 Table 3-3 Classification of xii LIST OF FIGURES. Page xv

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**concepts**and techniques for dealing with complex phe- nomena that do not lend themselves to analysis by classical methods based on probability theory and bivalent logic . Nevertheless , a question that is frequently raised by the ... Page xvi

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**concepts**of probability and possibility , with the latter**concept**having a close connection with that of membership in a fuzzy set . The**concept**of possibility plays a particularly important role in the representa- tion of meaning , in ... Page xviii

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**concepts**used are properly introduced and defined . Obviously this cannot be done in the same breadth as in the first volume . Also the coverage of fuzzy**concepts**in the second volume is restricted to those that are directly used in the ...### Contents

1 | |

8 | |

22 | |

4 | 44 |

The Extension Principle and Applications | 54 |

Fuzzy Relations on Sets and Fuzzy Sets | 71 |

3 | 82 |

7 | 88 |

Applications of Fuzzy Set Theory | 139 |

3 | 154 |

4 | 160 |

5 | 169 |

Fuzzy Sets and Expert Systems | 185 |

Fuzzy Control | 223 |

Fuzzy Data Bases and Queries | 265 |

Decision Making in Fuzzy Environments | 329 |

3 | 95 |

4 | 105 |

2 | 122 |

4 | 131 |

Applications of Fuzzy Sets in Engineering and Management | 371 |

Empirical Research in Fuzzy Set Theory | 443 |

Future Perspectives | 477 |

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### Common terms and phrases

a-level aggregation algebraic algorithm applications of fuzzy approach approximately areas base basic Bezdek chapter classical computational concepts considered constraints crisp criteria customers data analysis DataEngine decision defined definition defuzzification degree of membership described determine domain Dubois and Prade elements engineering example expert systems feature formal Fril fuzzy c-means fuzzy clustering fuzzy control fuzzy control systems fuzzy function fuzzy graph fuzzy logic fuzzy measures fuzzy numbers fuzzy relation fuzzy set Ć fuzzy set theory goal inference inference engine input integral intersection interval linear programming linguistic variable Mamdani mathematical measure of fuzziness membership function methods min-operator objective function operators optimal parameters possibility distribution probability probability theory problem properties respect rules scale level scheduling semantic solution structure Sugeno t-conorms t-norms Table tion trajectories truth tables truth values uncertainty vector x₁ Yager Zadeh Zimmermann µĆ(x µµ(x