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B. Billhardt E. Giraldes P. Marques-Smith P. Mendes Martins 《Periodica Mathematica Hungarica》2013,66(2):221-243
An associate inverse subsemigroup of a regular semigroup S is a subsemigroup T of S containing a least associate x* of each x ∈ S, in relation to the natural partial order ≤. In [1] the authors describe the structure of regular semigroups with an associate inverse subsemigroup, satisfying two natural conditions. In this paper we describe all *-homomorphisms and all *-congruences on such semigroups. 相似文献
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Gerhard Quinkert Uta-Maria Billhardt Harald Jakob Gerd Fischer Jürgen Glenneberg Peter Nagler Volker Autze Nana Heim Manfred Wacker Thomas Schwalbe Yvonne Kurth Jan W. Bats Gerd Dürner Gottfried Zimmermann Horst Kessler 《Helvetica chimica acta》1987,70(3):771-861
Photolactonization: A Novel Synthetic Entry to Macrolides o-Quinol acetates, hydroxyalkylated at C(6), are easily accessible from simple phenols by Wessely acetoxylation (preferentially catalyzed by BF3). On UV irradiation (in the presence of an appropriate tertiary amine), they are smoothly converted to macrocyclic lactones. Subtle conditions have been elaborated to lead to high overall yields, and the scope of the conversion of phenols to macrolides has been elucidated. 相似文献
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Bernd Billhardt 《Semigroup Forum》2001,63(3):422-428
We prove that any right amenably and naturally lattice ordered inverse semigroup is already amenably ordered. Among other
things this answers a question raised in [6].
August 9, 2000 相似文献
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On a wreath product embedding for regular semigroups 总被引:1,自引:0,他引:1
Bernd Billhardt 《Semigroup Forum》1993,46(1):62-72
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In Billhardt et al. (Semigroup Forum 79:101–118, 2009) the authors introduced the notion of an associate inverse subsemigroup of a regular semigroup, extending the concept of an associate subgroup of a regular semigroup, first presented in Blyth et al. (Glasg. Math. J. 36:163–171, 1994). The semigroups of these two classes admit axiomatic characterisations in terms of unary operations and can, therefore, be considered as unary semigroups. In this paper we introduce the notion of unary semigroup with associate inverse subsemigroup [with associate subgroup] and show that the classes of such unary semigroups form varieties. 相似文献
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On inverse semigroups the closure of whose set of idempotents is a clifford semigroup 总被引:1,自引:0,他引:1
Bernd Billhardt 《Semigroup Forum》1992,44(1):320-331
Communicated by Boris Schein 相似文献