A reduction in the number of independent axiom schemata for $S4$.
Simons, Leo
Notre Dame J. Formal Logic, Tome 3 (1962) no. 1, p. 256-258 / Harvested from Project Euclid
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Publié le : 1962-05-14
Classification:  02.27 
@article{1093957318,
     author = {Simons, Leo},
     title = {A reduction in the number of independent axiom schemata for $S4$.},
     journal = {Notre Dame J. Formal Logic},
     volume = {3},
     number = {1},
     year = {1962},
     pages = { 256-258},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1093957318}
}

Simons, Leo. A reduction in the number of independent axiom schemata for $S4$.. Notre Dame J. Formal Logic, Tome 3 (1962) no. 1, pp.  256-258. http://gdmltest.u-ga.fr/item/1093957318/