A note on $\pi^1_1$ ordinals.
Gass, Frederick S.
Notre Dame J. Formal Logic, Tome 13 (1972) no. 3, p. 103-104 / Harvested from Project Euclid
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Publié le : 1972-01-14
Classification:  02F27 
@article{1093894630,
     author = {Gass, Frederick S.},
     title = {A note on $\pi^1\_1$ ordinals.},
     journal = {Notre Dame J. Formal Logic},
     volume = {13},
     number = {3},
     year = {1972},
     pages = { 103-104},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1093894630}
}

Gass, Frederick S. A note on $\pi^1_1$ ordinals.. Notre Dame J. Formal Logic, Tome 13 (1972) no. 3, pp.  103-104. http://gdmltest.u-ga.fr/item/1093894630/