关于P($ω_1$)模有限中的$ω_3$ -链
On $ω_3$-chains in P($ω_1$) mod finite
摘要:
证明了如果存在一个简化的$(ω_1,2)$ -morass,则存在一个在P($ω_1$)mod finite中增加一个$ω_3$ -链的ccc强迫和一个从$ω_1$到$ω$中增加一族$ω_3$ -许多强几乎不交函数的ccc强迫.我们的想法是使用有限支持迭代的可数强迫这是不是线性的,但三维的。
英文摘要:
We prove that if there exists a simplified $(ω_1,2)$-morass, then there is a ccc forcing which adds an $ω_3$-chain in P($ω_1$) mod finite and a ccc forcing which adds a family of $ω_3$-many strongly almost disjoint functions from $ω_1$ to $ω$. The idea is to use a finite support iteration of countable forcings which is not linear but three-dimensional.
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