Siegfried Johannes Gottwald (30 March 1943 – 20 September 2015) was a German mathematician,

logic Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the study of deductively valid inferences or logical truths. It examines how conclusions follow from premises based on the structure o ...

ian and

historian of science The history of science covers the development of science from ancient history, ancient times to the present. It encompasses all three major branches of science: natural science, natural, social science, social, and formal science, formal. Pr ...

Life and work

Gottwald was born in Limbach, Saxony in 1943. From 1961 to 1966, he studied mathematics at the

University of Leipzig Leipzig University (), in Leipzig in Saxony, Germany, is one of the world's oldest universities and the second-oldest university (by consecutive years of existence) in Germany. The university was founded on 2 December 1409 by Frederick I, Electo ...

, where he was awarded his doctor title in 1969 and his

habilitation Habilitation is the highest university degree, or the procedure by which it is achieved, in Germany, France, Italy, Poland and some other European and non-English-speaking countries. The candidate fulfills a university's set criteria of excelle ...

in 1977. He was a tenured professor of non-classical and

mathematical Mathematics is a field of study that discovers and organizes methods, Mathematical theory, theories and theorems that are developed and Mathematical proof, proved for the needs of empirical sciences and mathematics itself. There are many ar ...

logic at the University of Leipzig where he taught from 1972 to his retirement in 2008. His main research areas are

fuzzy set Fuzzy or Fuzzies may refer to: Music * Fuzzy (band), a 1990s Boston indie pop band * Fuzzy (composer), Danish composer Jens Vilhelm Pedersen (born 1939) * Fuzzy (album), ''Fuzzy'' (album), 1993 debut album of American rock band Grant Lee Buffalo ...

s and fuzzy methodologies,

many-valued logic Many-valued logic (also multi- or multiple-valued logic) is a propositional calculus in which there are more than two truth values. Traditionally, in Aristotle's Term logic, logical calculus, there were only two possible values (i.e., "true" and ...

and the

history of mathematics The history of mathematics deals with the origin of discoveries in mathematics and the History of mathematical notation, mathematical methods and notation of the past. Before the modern age and the worldwide spread of knowledge, written examples ...

. He published several books on many-valued logic and on fuzzy sets and their applications, a co-authored textbook on

calculus Calculus is the mathematics, mathematical study of continuous change, in the same way that geometry is the study of shape, and algebra is the study of generalizations of arithmetic operations. Originally called infinitesimal calculus or "the ...

, and a reader in the history of logic. He also contributed to the German biographical dictionary of mathematicians, ''Lexikon berühmter Mathematiker''. Gottwald was Deputy Dean of the Faculty of Social Sciences and Philosophy at the University of Leipzig for several years. He was married with three children.

Published books

* *S. Gottwald, P. Günther, K. Beyer, V. Wünsch: ''Grundkurs Analysis.'' Parts 1–4, Math.-Naturwiss. Bibl., Vols. 53–56, Teubner: Leipzig 1972–74. * * * * * *

References

External links

Biography
{{DEFAULTSORT:Gottwald, Siegfried 1943 births 2015 deaths People from Limbach-Oberfrohna 20th-century German mathematicians 21st-century German mathematicians Mathematical logicians Academic staff of Leipzig University Leipzig University alumni German historians of science