Where Ma First Fails
Kunen, Kenneth
J. Symbolic Logic, Tome 53 (1988) no. 1, p. 429-433 / Harvested from Project Euclid
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If $\theta$ is any singular cardinal of cofinality $\omega_1$, we produce a forcing extension in which MA holds below $\theta$ but fails at $\theta$. The failure is due to a partial order which splits a gap of size $\theta$ in $\mathscr{P}(\omega)$.
Publié le : 1988-06-14
Classification:  
@article{1183742633,
     author = {Kunen, Kenneth},
     title = {Where Ma First Fails},
     journal = {J. Symbolic Logic},
     volume = {53},
     number = {1},
     year = {1988},
     pages = { 429-433},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1183742633}
}

Kunen, Kenneth. Where Ma First Fails. J. Symbolic Logic, Tome 53 (1988) no. 1, pp.  429-433. http://gdmltest.u-ga.fr/item/1183742633/