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* Principles of Mathematical Logic* is the 1950

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.

**^**Curry, Haskell B. (1953). "Review:*Grundzüge der theoretischen Logik*(3rd edition)" (PDF).*Bull. Amer. Math. Soc*.**59**(3): 263–267. doi:10.1090/s0002-9904-1953-09701-4. The translation of the 1938 2nd German edition into English was published in 1950, while the 3rd German edition was published in 1949.**^**Rosser, Barkley (1938). "Review:*Grundzüge der theoretischen Logik*(2nd edition)" (PDF).*Bull. Amer. Math. Soc*.**44**(7): 474–475. doi:10.1090/s0002-9904-1938-06760-2.**^**Langford, C. H (1930). "Review of*Grundzüge der theoretischen Logik*by D. Hilbert and W. Ackermann" (PDF).*Bull. Amer. Math. Soc*.**36**(1): 22–25. doi:10.1090/s0002-9904-1930-04859-4.

- David Hilbert and Wilhelm Ackermann (1928).
*Grundzüge der theoretischen Logik*(*Principles of Mathematical Logic*). Springer-Verlag, ISBN 0-8218-2024-9. This text went into four subsequent German editions, the last in 1972. - Translators: Lewis M. Hammond, George G. Leckie & F. Steinhardt (1999)
*Principles of Mathematical Logic*at Google Books - Hendricks, Neuhaus, Petersen, Scheffler and Wansing (eds.) (2004).
*First-order logic revisited*. Logos Verlag, ISBN 3-8325-0475-3. Proceedings of a workshop, FOL-75, commemorating the 75th anniversary of the publication of Hilbert and Ackermann (1928).