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Communicated by Boris M. Schein
Address held on May 29, 1994 in Kočovce at the Conference in Honor of Štefan Schwarz on the Occasion of his 80th Birthday on May 18, 1994
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Hofmann, K.H. From a topological theory of semigroups to a geometric one. Semigroup Forum 50, 123–134 (1995). https://doi.org/10.1007/BF02573511
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DOI: https://doi.org/10.1007/BF02573511