Finite binary relations have no more complexity than finite semigroups.
Semigroup forum, Tome 7 (1974), pp. 92-103
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@article{SF_1974__7_134004,
author = {John Rhodes},
title = {Finite binary relations have no more complexity than finite semigroups.},
journal = {Semigroup forum},
pages = {92--103},
publisher = {mathdoc},
volume = {7},
year = {1974},
zbl = {0294.20057},
url = {http://geodesic.mathdoc.fr/item/SF_1974__7_134004/}
}
John Rhodes. Finite binary relations have no more complexity than finite semigroups.. Semigroup forum, Tome 7 (1974), pp. 92-103. http://geodesic.mathdoc.fr/item/SF_1974__7_134004/