On Formally Undecidable Propositions in Principia Mathematica and Related Systems I | Wikipedia  ...
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Date: 07/10/2019

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SUMMARY
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"Über formal unentscheidbare Sätze der Principia Mathematica und verwandter Systeme I" ("On Formally Undecidable Propositions of Principia Mathematica and Related Systems I") is a paper in mathematical logic by Kurt Gödel.  Dated November 17, 1930, it was originally published in German in the 1931 volume of Monatshefte für Mathematik.  Several English translations have appeared in print, and the paper has been included in two collections of classic mathematical logic papers. The paper contains Gödel's incompleteness theorems, now fundamental results in logic that have many implications for consistency proofs in mathematics. The paper is also known for introducing new techniques that Gödel invented to prove the incompleteness theorems.