Classification of the semigroups of order three and four


Abstract in English

In this paper we are presenting a new method for studying the semigroups of order three and four. We are going to explore these semigroups and illustrate a better description of them while observing their enormous increasing in number for larger orders. We are presenting the methods we wrote and followed during our study of associativity and during the classification process.

References used

Clifford, A. H. and Preston, G. B. (1961). The Algebraic Theory of Semigroups, Vol. I. Mathematical Surveys of the American Mathematical Society No.7. p.1
Griess, R. L. (1982). The friendly giant. Inventiones Mathematicae 69 (1): 1- 102
Forsythe, G. E. (1955). SWAC computes 126 distinct Semigroups of order 4. Proc. Amer. Math. Soc., 6:443-447

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