Abstract
Let σ be a nontrivial permutation of ordern. A semigroupS is said to be σ-permutable ifx 1 x 2 ...x n =x σ(1) x σ(2) ...x σ(n) , for every (x 1 ,x 2,...,x n )∈S n. A semigroupS is called(r,t)-commutative, wherer,t are in ℕ*, ifx 1 ...x r x r+1 ...x r+t =x r+1 ...x r+t x 1 ...x r , for every (x 1 ,x 2,...,x r+t ∈S r+t. According to a result of M. Putcha and A. Yaqub ([11]), if σ is a fixed-point-free permutation andS is a σ-permutable semigroup then there existsk ∈ ℕ* such thatS is (1,k)-commutative. In [8], S. Lajos raises up the problem to determine the leastk=k(n) ∈ ℕ* such that, for every fixed-point-free permutation σ of ordern, every σ-permutable semigroup is also (1,k)-commutative. In this paper this problem is solved for anyn less than or equal to eight and also whenn is any odd integer. For doing this we establish that if a semigroup satisfies a permutation identity of ordern then inevitably it also satisfies some permutation identities of ordern+1.
Similar content being viewed by others
References
Chrislock, J. L.,On medial semigroups, Journal of Algebra,12 (1969), 1–9.
Garzon, M., and Zalcstein, Y.,On permutation properties in groups, and semigroups, Semigroup Forum,35 (1987), 337–351.
Gutan, M.,Sur une propriété de permutation des semi-groupes, C.R. Acad. Sci. Paris, t.317 (1993), Série I, 923–924.
Gutan, M.,Sur les semi-groupes satisfaisant des identités permutationnelles, C.R. Acad. Sci. Paris, t.319 (1994), Série I, 5–10.
Khan, N. M.,On saturated permutative varieties and consequences of permutation identities, J. Australian Math. Soc. (Series A)38 (1985), 186–197.
Lajos, S.,Fibonacci characterizations and (m, n)-commutativity in semigroup theory, Pure Mathematics and Applications, ser. A,1 (1990), 59–65.
Lajos, S.,Notes on (2,3)-commutative semigroups, Math. Japonica,37 (1992), 201–204.
Lajos, S.,Some remarks on (m,n)-commutative semigroups, Pure Mathematics and Applications, ser. A,3 (1992), 215–217.
Nagy, A.,On the structure of (m, n)-commutative semigroups, Semigroup Forum,45 (1992), 183–190.
Nagy, A.,Subdirectly irreducible completely symmetrical semigroups, Semigroup Forum,45 (1992), 267–271.
Putcha, M., and Yaqub, A.,Semigroups satisfying permutation identities, Semigroup Forum,3 (1971), 77–83.
Author information
Authors and Affiliations
Additional information
Communicated by J. M. Howie
Rights and permissions
About this article
Cite this article
Gutan, M. A problem on semigroups satisfying permutation identities. Semigroup Forum 53, 173–183 (1996). https://doi.org/10.1007/BF02574132
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02574132