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Dec 16, 2017 at 16:23 comment added Joseph Van Name The simplest such $X$ is probably $\omega_{1}$.
Dec 15, 2017 at 15:32 comment added მამუკა ჯიბლაძე Still, which single simplest $X$ would you suggest?
Jul 28, 2014 at 14:06 history answered Joseph Van Name CC BY-SA 3.0