Kurt Gödel

Mathematical logician and philosopher (1906–1978) / From Wikipedia, the free encyclopedia

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Kurt Friedrich Gödel (/ˈɡɜːrdəl/ GUR-dəl,[2] German: [kʊʁt ˈɡøːdl̩] ; April 28, 1906 – January 14, 1978) was a logician, mathematician, and philosopher. Considered along with Aristotle and Gottlob Frege to be one of the most significant logicians in history, Gödel had an immense effect upon scientific and philosophical thinking in the 20th century, a time when others such as Bertrand Russell,[3] Alfred North Whitehead,[3] and David Hilbert were using logic and set theory to investigate the foundations of mathematics, building on earlier work by the likes of Richard Dedekind, Georg Cantor and Gottlob Frege.

Quick facts: Kurt Gödel, Born, Died, Citizenship, Alma&nbs...
Kurt Gödel
Gödel c. 1926
Kurt Friedrich Gödel

(1906-04-28)April 28, 1906
Brünn, Austria-Hungary (now Brno, Czech Republic)
DiedJanuary 14, 1978(1978-01-14) (aged 71)
  • Austria
  • Czechoslovakia
  • Germany
  • United States
Alma materUniversity of Vienna (PhD, 1930)
Known for
Adele Nimbursky
(m. 1938)
Scientific career
FieldsMathematics, mathematical logic, analytic philosophy, physics
InstitutionsInstitute for Advanced Study
ThesisÜber die Vollständigkeit des Logikkalküls (1929)
Doctoral advisorHans Hahn

Gödel's discoveries in the foundations of mathematics led to the proof of his completeness theorem in 1929 as part of his dissertation to earn a doctorate at the University of Vienna, and the publication of Gödel's incompleteness theorems two years later, in 1931. The first incompleteness theorem states that for any ω-consistent recursive axiomatic system powerful enough to describe the arithmetic of the natural numbers (for example, Peano arithmetic), there are true propositions about the natural numbers that can be neither proved nor disproved from the axioms.[4] To prove this, Gödel developed a technique now known as Gödel numbering, which codes formal expressions as natural numbers. The second incompleteness theorem, which follows from the first, states that the system cannot prove its own consistency.[5]

Gödel also showed that neither the axiom of choice nor the continuum hypothesis can be disproved from the accepted Zermelo–Fraenkel set theory, assuming that its axioms are consistent. The former result opened the door for mathematicians to assume the axiom of choice in their proofs. He also made important contributions to proof theory by clarifying the connections between classical logic, intuitionistic logic, and modal logic.

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