Higher Gap Morasses, IA: Gap-Two Morasses and Condensation
Morgan, Charles
J. Symbolic Logic, Tome 63 (1998) no. 1, p. 753-787 / Harvested from Project Euclid
This paper concerns the theory of morasses. In the early 1970s Jensen defined ($\kappa,\alpha$)-morasses for uncountable regular cardinals $\kappa$ and ordinals $\alpha < \kappa$. In the early 1980s Velleman defined ($\kappa$, 1)-simplified morasses for all regular cardinals $\kappa$. He showed that there is a ($\kappa$, 1)-simplified morass if and only if there is ($\kappa$, 1)-morass. More recently he defined ($\kappa$, 2)-simplified morasses and Jensen was able to show that if there is a ($\kappa$, 2)-morass then there is a ($\kappa$, 2)-simplified morass. In this paper we prove the converse of Jensen's result, i.e., that if there is a ($\kappa$, 2)-simplified morass then there is a ($\kappa$, 2)-morass.
Publié le : 1998-09-14
Classification: 
@article{1183745565,
     author = {Morgan, Charles},
     title = {Higher Gap Morasses, IA: Gap-Two Morasses and Condensation},
     journal = {J. Symbolic Logic},
     volume = {63},
     number = {1},
     year = {1998},
     pages = { 753-787},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1183745565}
}
Morgan, Charles. Higher Gap Morasses, IA: Gap-Two Morasses and Condensation. J. Symbolic Logic, Tome 63 (1998) no. 1, pp.  753-787. http://gdmltest.u-ga.fr/item/1183745565/