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Cardinality of retracts of monounary algebras
Czechoslovak Mathematical Journal, Tome 58 (2008) no. 2, pp. 469-479 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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For an uncountable monounary algebra $(A,f)$ with cardinality $\kappa $ it is proved that $(A,f)$ has exactly $2^{\kappa }$ retracts. The case when $(A,f)$ is countable is also dealt with.
For an uncountable monounary algebra $(A,f)$ with cardinality $\kappa $ it is proved that $(A,f)$ has exactly $2^{\kappa }$ retracts. The case when $(A,f)$ is countable is also dealt with.
Classification : 08A60
Keywords: monounary algebra; retract; cardinality 
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     title = {Cardinality of retracts of monounary algebras},
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Jakubíková-Studenovská, Danica; Pócs, Jozef. Cardinality of retracts of monounary algebras. Czechoslovak Mathematical Journal, Tome 58 (2008) no. 2, pp. 469-479. http://geodesic.mathdoc.fr/item/CMJ_2008_58_2_a11/

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