Browsing by Subject "D-semigroup"
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D-semigroups and constellations
(Springer, 2017)In a result generalising the Ehresmann–Schein–Nambooripad Theorem relating inverse semigroups to inductive groupoids, Lawson has shown that Ehresmann semigroups correspond to certain types of ordered (small) categories he ... -
Generalised domain and E-inverse semigroups
(Springer, 2018)A generalised D-semigroup is here defined to be a left E-semiabundant semigroup S in which the \overline{\mathcal R}_E-class of every x\in S contains a unique element D(x) of E, made into a unary semigroup. Two-sided ...