A matrix characterization of the maximal groups in $\beta_X$
Czechoslovak Mathematical Journal, Tome 25 (1975) no. 2, pp. 274-278
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DOI : 10.21136/CMJ.1975.101317
Classification : 20M20
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Hartfiel, Darald J.; Maxson, Carlton J. A matrix characterization of the maximal groups in $\beta_X$. Czechoslovak Mathematical Journal, Tome 25 (1975) no. 2, pp. 274-278. doi: 10.21136/CMJ.1975.101317

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[5] Stefan Schwarz: The semigroup of binary relations on a finite set. presented to the International Symposium on Semigroups, Bratislava, Czechoslovakia, June, 1968.

[6] Stefan Schwarz: On idempotent binary relations on a finite set. Czechoslovak Mathematical Journal, 20 (1970), 696-702. | MR

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