Finite-to-one maps
Forster, Thomas
J. Symbolic Logic, Tome 68 (2003) no. 1, p. 1251-1253 / Harvested from Project Euclid
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It is shown in ZF (without choice) that if there is a finite-to-one map 𝒫(X) ↠ X, then X is finite.
Publié le : 2003-12-14
Classification:  
@article{1067620184,
     author = {Forster, Thomas},
     title = {Finite-to-one maps},
     journal = {J. Symbolic Logic},
     volume = {68},
     number = {1},
     year = {2003},
     pages = { 1251-1253},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1067620184}
}

Forster, Thomas. Finite-to-one maps. J. Symbolic Logic, Tome 68 (2003) no. 1, pp.  1251-1253. http://gdmltest.u-ga.fr/item/1067620184/