Two notes on Ackermann's set theory.
Lake, John
Notre Dame J. Formal Logic, Tome 17 (1976) no. 1, p. 446-448 / Harvested from Project Euclid
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Publié le : 1976-07-14
Classification:  02K10,  02K05 
@article{1093887639,
     author = {Lake, John},
     title = {Two notes on Ackermann's set theory.},
     journal = {Notre Dame J. Formal Logic},
     volume = {17},
     number = {1},
     year = {1976},
     pages = { 446-448},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1093887639}
}

Lake, John. Two notes on Ackermann's set theory.. Notre Dame J. Formal Logic, Tome 17 (1976) no. 1, pp.  446-448. http://gdmltest.u-ga.fr/item/1093887639/