Geodesic
Automorphisms of the Semigroup of all Relations on a Set
Canadian mathematical bulletin, Tome 9 (1966) no. 1, pp. 73-77

Voir la notice de l'article provenant de la source Cambridge University Press

An automorphism Φ of a semigroup S is said to be an inner automorphism if there exists a unit u in S such that for each a in S. 
Jr., Kenneth D. Magill. Automorphisms of the Semigroup of all Relations on a Set. Canadian mathematical bulletin, Tome 9 (1966) no. 1, pp. 73-77. doi: 10.4153/CMB-1966-009-7
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