TURING, Alan. 'The Word problem in Semi-groups with Cancellation.' Offprint from: Annals of Mathematics, vol. 2, No. 52. Princeton, NJ: September 1950. 8f (255 x 174mm). 16pp., 491-505. Original pale yellow wrappers, stapled (covers faintly soiled and creased, staples just beginning to rust).
RARE: this offprint not in the Newman collection of Turing offprints at Bletchley Park. Turing here gives proof that the word problem is undecidable for semi-groups with cancellation.
TURING, Alan. 'The Word problem in Semi-groups with Cancellation.' Offprint from: Annals of Mathematics, vol. 2, No. 52. Princeton, NJ: September 1950. 8f (255 x 174mm). 16pp., 491-505. Original pale yellow wrappers, stapled (covers faintly soiled and creased, staples just beginning to rust).
RARE: this offprint not in the Newman collection of Turing offprints at Bletchley Park. Turing here gives proof that the word problem is undecidable for semi-groups with cancellation.
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