The connective of necessity of modal logic ${\rm S}5$ is metalogical.
Dywan, Zdzisław
Notre Dame J. Formal Logic, Tome 24 (1983) no. 1, p. 410-414 / Harvested from Project Euclid
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Publié le : 1983-07-14
Classification:  03B45,  03B05 
@article{1093870385,
     author = {Dywan, Zdzis\l aw},
     title = {The connective of necessity of modal logic ${\rm S}5$ is metalogical.},
     journal = {Notre Dame J. Formal Logic},
     volume = {24},
     number = {1},
     year = {1983},
     pages = { 410-414},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1093870385}
}

Dywan, Zdzisław. The connective of necessity of modal logic ${\rm S}5$ is metalogical.. Notre Dame J. Formal Logic, Tome 24 (1983) no. 1, pp.  410-414. http://gdmltest.u-ga.fr/item/1093870385/