On Free Products of Semigroups and a New
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James Renshaw
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Article
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2002
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Elsevier Science
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English
β 58 KB
Isbell proved his famous zigzag theorem for semigroups using essentially topological methods in [Epimorphisms and dominions, in "Proceedings of the Conference on Categorical Algebra, La Jolla, 1965," pp. 232-246]. Since then a number of authors have proved this result using a variety of different te