A note on the arithmetical hierarchy.
Bloom, Stephen L.
Notre Dame J. Formal Logic, Tome 9 (1968) no. 1, p. 89-91 / Harvested from Project Euclid
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Publié le : 1968-01-14
Classification:  02.77 
@article{1093893357,
     author = {Bloom, Stephen L.},
     title = {A note on the arithmetical hierarchy.},
     journal = {Notre Dame J. Formal Logic},
     volume = {9},
     number = {1},
     year = {1968},
     pages = { 89-91},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1093893357}
}

Bloom, Stephen L. A note on the arithmetical hierarchy.. Notre Dame J. Formal Logic, Tome 9 (1968) no. 1, pp.  89-91. http://gdmltest.u-ga.fr/item/1093893357/