AI 中文总结
本文针对埃斯丘提出的组合原理W*_{κ⁺}(κ⁺⁺)是否在可构造宇宙L中成立的问题给出肯定解答,进而解决了1972年耶赫关于苏斯林森林的相关问题。
AI 中文摘要
1972年,耶赫(Jech)询问在可构造宇宙(L)中是否存在苏斯林(ω₁, ω₂)-森林。据耶赫所述,拉弗(Laver)给出了肯定答案,但他的证明从未发表且现已不可得。2015年,埃斯丘(Eskew)引入组合原理W*_κ(λ),这是西尔弗原理的强化形式,并利用它构造了一个相干苏斯林(κ, λ)-森林。随后他询问,对每个正则基数κ,原理W*_{κ⁺}(κ⁺⁺)是否在L中成立。我们对埃斯丘的问题给出了肯定回答,从而也解决了耶赫的问题。
英文摘要
In 1972, Jech asked whether there exists a Suslin $(ω_1, ω_2)$-forest in the constructible universe. As reported by Jech, Laver gave a positive answer, but his proof was never published and appears no longer to be available. In 2015, Eskew introduced the combinatorial principle $W^*_κ(λ)$, a strengthening of Silver's principle, and used it to construct a coherent Suslin $(κ, λ)$-forest. He then asked whether the principle $W^*_{κ^+}(κ^{++})$ holds in $\mathsf{L}$ for every regular cardinal $κ$. We give an affirmative answer to Eskew's question, thereby also settling Jech's question.
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