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arXiv 1508.03316math.LO
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范畴与无穷逻辑

Categoricity and infinitary logics

Will Boney, Sebastien Vasey

摘要:

我们指出了一个差距在Shelah的证明以下结果:$\mathbf{Claim}$让$K$是一个抽象的小学类范畴在unboundedly许多基数。则存在基数$λ$使得无论何时$M, N \in K$的大小至少为$λ$,$M \le N$当且仅当$M \preceq_{L_{\infty, \text{LS} (K)^+}} N$。这一主张的重要性在于以下定理,这一定理隐含在希拉的工作中:$\mathbf{Theorem}$假设这一主张。设$K$是一个抽象初等类,它在无限多基数中是范畴的。然后$λ$的类使得:1)$K$在$λ$中是范畴的; 2)$K$在$λ$中具有合并;以及3)存在好的$λ$ -框架,其基础类$K_λ$是平稳的。给出了一个证明,并讨论了相关问题.

英文摘要:

We point out a gap in Shelah's proof of the following result: $\mathbf{Claim}$ Let $K$ be an abstract elementary class categorical in unboundedly many cardinals. Then there exists a cardinal $λ$ such that whenever $M, N \in K$ have size at least $λ$, $M \le N$ if and only if $M \preceq_{L_{\infty, \text{LS} (K)^+}} N$. The importance of the claim lies in the following theorem, implicit in Shelah's work: $\mathbf{Theorem}$ Assume the claim. Let $K$ be an abstract elementary class categorical in unboundedly many cardinals. Then the class of $λ$ such that: 1) $K$ is categorical in $λ$; 2) $K$ has amalgamation in $λ$; and 3) there is a good $λ$-frame with underlying class $K_λ$ is stationary. We give a proof and discuss some related questions.

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