关于非$σ$ - Well Ordered Linear Orders的Galvin问题
Galvin's Question on non-$σ$-Well Ordered Linear Orders
摘要:
假设$\mathcal{C}$是所有线性序$L$的类,使得$L$不是良序集的可数并集,并且$L$的每个不可数子集都包含$ω_1$的一个副本。我们证明了$\mathcal{C}$有极小元是相容的。这回答了一个老问题,由于高尔文。
英文摘要:
Assume $\mathcal{C}$ is the class of all linear orders $L$ such that $L$ is not a countable union of well ordered sets, and every uncountable subset of $L$ contains a copy of $ω_1$. We show it is consistent that $\mathcal{C}$ has minimal elements. This answers an old question due to Galvin.
机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。