On Classes Closed Under Unions of Chains

Miller, Douglas E.

J. Symbolic Logic, Tome 44 (1979) no. 1, p. 29-31 / Harvested from Project Euclid

Résumé

We improve a general theorem of J. A. Makowsky which characterizes, for a wide class of languages, those sentences $\theta$ such that both $\operatorname{Mod}(\theta)$ and $\operatorname{Mod}(\neg\theta)$ are closed under unions of chains.

Publié le : 1979-03-14
Classification:

@article{1183740340,
     author = {Miller, Douglas E.},
     title = {On Classes Closed Under Unions of Chains},
     journal = {J. Symbolic Logic},
     volume = {44},
     number = {1},
     year = {1979},
     pages = { 29-31},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1183740340}
}

Miller, Douglas E. On Classes Closed Under Unions of Chains. J. Symbolic Logic, Tome 44 (1979) no. 1, pp.  29-31. http://gdmltest.u-ga.fr/item/1183740340/