A construction is given, in a variety of groups, of a ``functorial center'' called the endocenter. The endocenter facilitates the identification of universal multiplication groups of groups in the variety, addressing the problem of determining when combinatorial multiplication groups are universal.
@article{118421, author = {Jon D. Phillips and Jonathan D. H. Smith}, title = {The endocenter and its applications to quasigroup representation theory}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {32}, year = {1991}, pages = {417-422}, zbl = {0748.20016}, mrnumber = {1159788}, language = {en}, url = {http://dml.mathdoc.fr/item/118421} }
Phillips, Jon D.; Smith, Jonathan D. H. The endocenter and its applications to quasigroup representation theory. Commentationes Mathematicae Universitatis Carolinae, Tome 32 (1991) pp. 417-422. http://gdmltest.u-ga.fr/item/118421/
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