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On pseudovarieties. (English) Zbl 0351.20035


MSC:

20M99 Semigroups
20M05 Free semigroups, generators and relations, word problems
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References:

[1] Garrett, Birkhoff, On the structure of abstract algebras, (Proc. Cambridge Phil. Soc., 31 (1935)), 433-454 · Zbl 0013.00105
[2] Samuel, Eilenberg, (Automata, Languages and Machines, Vol. B (1976), Academic Press: Academic Press New York) · Zbl 0359.94067
[3] Sheila, Oates; Powell, M. B., Identical relations in finite groups, J. Algebra, 1, 11-39 (1964) · Zbl 0121.27202
[4] Peter, Perkins, Bases for equational theories of semigroups, J. Algebra, 11, 298-314 (1968) · Zbl 0186.03401
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