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On fuzzy ideals and fuzzy bi-ideals in semigroups. (English) Zbl 0452.20060


MSC:

20M10 General structure theory for semigroups
20M20 Semigroups of transformations, relations, partitions, etc.
20M12 Ideal theory for semigroups
03E72 Theory of fuzzy sets, etc.
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[1] Clifford, A.H.; Preston, G.B., ()
[2] Kuroki, N., Fuzzy bi-ideals in semigroups, Comm. math. univ. st. Pauli, 28, 17-21, (1979) · Zbl 0428.20041
[3] lajos, S., A note on completely regular semigroups, Acta sci. math. (Szeged), 28, 261-265, (1967) · Zbl 0157.04803
[4] lajos, S., On (m, n)-ideals in regular duo semigroups, Acta sci. math. (Szeged), 31, 179-180, (1970) · Zbl 0196.04102
[5] Lajos, S., Theorems on (1,1)-ideals in semigroups, (1972), Dept. Math., K. Marx Univ. Economics · Zbl 0245.20058
[6] Petrich, M., Introduction to semigroups, (1973), Columbus, OH · Zbl 0321.20037
[7] Rosenfeld, A., Fuzzy groups, J. math. anal. appl., 35, 512-517, (1971) · Zbl 0194.05501
[8] Saitō, T., On semigroups which are semilattices of left simple semigroups, Math. japon., 18, 95-97, (1973) · Zbl 0283.20047
[9] Zadeh, L.A., Fuzzy sets, Information and control, 8, 338-353, (1965) · Zbl 0139.24606
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