Principles of Mathematical Logic

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Principles of Mathematical Logic is the 1950{{cite journal|author=Curry, Haskell B.|authorlink=Haskell Curry|title=Review: Grundzüge der theoretischen Logik (3rd edition)|journal=Bull. Amer. Math. Soc.|year=1953|volume=59|issue=3|pages=263–267|url=https://www.ams.org/journals/bull/1953-59-03/S0002-9904-1953-09701-4/S0002-9904-1953-09701-4.pdf|doi=10.1090/s0002-9904-1953-09701-4|doi-access=free}} The translation of the 1938 2nd German edition into English was published in 1950, while the 3rd German edition was published in 1949. American translation of the 1938 second edition{{cite journal|author=Rosser, Barkley|authorlink=J. Barkley Rosser|title=Review: Grundzüge der theoretischen Logik (2nd edition)|journal=Bull. Amer. Math. Soc.|year=1938|volume=44|issue=7|pages=474–475|url=https://www.ams.org/journals/bull/1938-44-07/S0002-9904-1938-06760-2/S0002-9904-1938-06760-2.pdf|doi=10.1090/s0002-9904-1938-06760-2|doi-access=free}} of David Hilbert's and Wilhelm Ackermann's classic text Grundzüge der theoretischen Logik,{{cite journal|author=Langford, C. H|authorlink=Cooper Harold Langford|title=Review of Grundzüge der theoretischen Logik by D. Hilbert and W. Ackermann|journal=Bull. Amer. Math. Soc.|year=1930|volume=36|issue=1|pages=22–25|url=https://www.ams.org/bull/1930-36-01/S0002-9904-1930-04859-4/S0002-9904-1930-04859-4.pdf|doi=10.1090/s0002-9904-1930-04859-4|doi-access=free}} on elementary mathematical logic. The 1928 first edition thereof is considered the first elementary text clearly grounded in the formalism now known as first-order logic (FOL). Hilbert and Ackermann also formalized FOL in a way that subsequently achieved canonical status. FOL is now a core formalism of mathematical logic, and is presupposed by contemporary treatments of Peano arithmetic and nearly all treatments of axiomatic set theory.

The 1928 edition included a clear statement of the Entscheidungsproblem (decision problem) for FOL, and also asked whether that logic was complete (i.e., whether all semantic truths of FOL were theorems derivable from the FOL axioms and rules). The former problem was answered in the negative first by Alonzo Church and independently by Alan Turing in 1936. The latter was answered affirmatively by Kurt Gödel in 1929.

In its description of set theory, mention is made of Russell's paradox and the Liar paradox (page 145). Contemporary notation for logic owes more to this text than it does to the notation of Principia Mathematica, long popular in the English speaking world.