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  1. Siegfried Gottwald, Many-Valued Logic. Stanford Encyclopedia of Philosophy.
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  2. Siegfried Gottwald (2008). Mathematical Fuzzy Logics. Bulletin of Symbolic Logic 14 (2):210-239.
    The last decade has seen an enormous development in infinite-valued systems and in particular in such systems which have become known as mathematical fuzzy logics. The paper discusses the mathematical background for the interest in such systems of mathematical fuzzy logics, as well as the most important ones of them. It concentrates on the propositional cases, and mentions the first-order systems more superficially. The main ideas, however, become clear already in this restricted setting.
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  3. Siegfried Gottwald (2006). Universes of Fuzzy Sets and Axiomatizations of Fuzzy Set Theory. Part I: Model-Based and Axiomatic Approaches. [REVIEW] Studia Logica 82 (2):211 - 244.
    For classical sets one has with the cumulative hierarchy of sets, with axiomatizations like the system ZF, and with the category SET of all sets and mappings standard approaches toward global universes of all sets. We discuss here the corresponding situation for fuzzy set theory.Our emphasis will be on various approaches toward (more or less naively formed)universes of fuzzy sets as well as on axiomatizations, and on categories of fuzzy sets.
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  4. Siegfried Gottwald (2006). Universes of Fuzzy Sets and Axiomatizations of Fuzzy Set Theory. Part II: Category Theoretic Approaches. Studia Logica 84 (1):23 - 50.
    For classical sets one has with the cumulative hierarchy of sets, with axiomatizations like the system ZF, and with the category SET of all sets and mappings standard approaches toward global universes of all sets.We discuss here the corresponding situation for fuzzy set theory. Our emphasis will be on various approaches toward (more or less naively formed) universes of fuzzy sets as well as on axiomatizations, and on categories of fuzzy sets.
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  5. Siegfried Gottwald (1984). T-Norms and Φ-Operators as Truth Functions of Many Valued Connectives. Bulletin of the Section of Logic 13 (2):55-58.
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  6. Siegfried Gottwald (1972). Verallgemeinerte Peano‐Systeme. Mathematical Logic Quarterly 18 (1‐3):19-30.
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  7. Siegfried Gottwald (1971). Zahlbereichskonstruktionen in einer Mehrwertigen Mengenlehre. Mathematical Logic Quarterly 17 (1):145-188.
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