Abstract
The word problem1, stated relative to one or another algebraic system, has attracted the attention of many mathematicians. In the works of A.A. Markov [1] and E. Post [3] it was proved for the first time that there exist algebraic systems (semigroups) with undecidable word problem. The most significant achievement in this direction is the result of P.S. Novikov [2] that establishes undecidability of the word problem for groups. In 1950, A.I. Zhukov [5], while studying free nonassociative algebras, established that in the case in which one does not assume that the algebra satisfies any identical relation (for instance, associativity) the word problem (as well as some other algorithmic problems) is decidable. From the results obtained for semigroups, it easily follows that the word problem is undecidable for associative algebras.
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References
A.A. Markov, On the impossibility of certain algorithms in the theory of associative systems, Doklady Akad. Nauk USSR 55 (1947), no. 7, 587–591.
P.S. Novikov, On the algorithmic unsolvability of the problem of identity, Doklady Akad. Nauk USSR 85 (1952), no. 4, 709–712.
E. Post, Recursive unsolvability of a problem of Thue, J. Symbolic Logic 12 (1947) 1–11.
A.I. Shirshov, Subalgebras of free commutative and free anticommutative algebras, Mat. Sbornik 34 (1954), no. 1, 81–88.
A.I. Zhukov, Reduced systems of defining relations in nonassociative algebras, Mat. Sbornik 27 (1950), no. 2, 267–280.
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© 2009 Birkhäuser Verlag, P.O. Box 133, CH-4010 Basel, Switzerland
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Shirshov, A. (2009). Some Algorithmic Problems for ε-algebras. In: Bokut, L., Shestakov, I., Latyshev, V., Zelmanov, E. (eds) Selected Works of A.I. Shirshov. Contemporary Mathematicians. Birkhäuser Basel. https://doi.org/10.1007/978-3-7643-8858-4_12
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DOI: https://doi.org/10.1007/978-3-7643-8858-4_12
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