## 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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One of the major changes in the industrial environment since the early 90s is, that we have moved from a

One of the major changes in the industrial environment since the early 90s is, that we have moved from a

**situation**of a lack of (electronically readable) data to one of an abundance of such data. Together with the dramatic increase in ... Page 2

supposed to model reality adequately, then the modeling language has to be suited to model the characteristics of the

supposed to model reality adequately, then the modeling language has to be suited to model the characteristics of the

**situation**under study appropriately. The utter importance of the modeling language is recognized by Apostel, ... Page 3

Real

Real

**situations**are very often not crisp and deterministic, and they cannot be described precisely. 2. The complete description of a real ... This**situation**has already been recognized by thinkers in the past. In 1923 the philosopher B. Page 4

The evaluation of the economic

The evaluation of the economic

**situation**depends on the actual securities, that is, the difference between property and debts, and on the liquidity, that is, the continuous difference between income and expenses. On the other hand, ... Page 6

It can also be considered as a modeling language well suited for

It can also be considered as a modeling language well suited for

**situations**in which fuzzy relations, criteria, and phenomena exist. Fuzziness has so far not been defined uniquely semantically, and probably never will be.### What people are saying - Write a review

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### Contents

9 | |

11 | |

16 | |

22 | |

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