Collapsing Modalities
Humberstone, Lloyd
Notre Dame J. Formal Logic, Tome 50 (2009) no. 1, p. 119-132 / Harvested from Project Euclid
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Sections 1 and 2 respectively raise and settle the question of whether, if an affirmative modality collapses (reduces to the null modality, that is) in a normal modal logic, then all modalities of the same length collapse in that logic, while Section 3 considers some special cases of an analogous phenomenon for congruential modal logics, closing with a general question about collapsing modalities in this broader range of logics.
Publié le : 2009-04-15
Classification:  modal logic,  modalities,  03B45 
@article{1242067705,
     author = {Humberstone, Lloyd},
     title = {Collapsing Modalities},
     journal = {Notre Dame J. Formal Logic},
     volume = {50},
     number = {1},
     year = {2009},
     pages = { 119-132},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1242067705}
}

Humberstone, Lloyd. Collapsing Modalities. Notre Dame J. Formal Logic, Tome 50 (2009) no. 1, pp.  119-132. http://gdmltest.u-ga.fr/item/1242067705/