Explanation of Independence

Explanation of Independence
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独立性的解释

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发表时间:
2005
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通讯作者:
Hans Adler
Hans Adler
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作者:
Hans Adler

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给出了完全一阶理论的“独立关系”(独立概念)的公理化处理,主要的例子是分叉(由于Shelah)和刺分叉(由于Onshuus)。叉刺是用代数闭集格中的模对来表示的。在可能的情况下,用统一的方式处理分叉和刺分叉。它们是双重的,因为分叉是最好的(最严格的),而刺分叉是最粗糙的独立关系,值得研究。最后,我们定义了一个不可分辨序列的核,并研究了它与正则基的关系。
An axiomatic treatment of `independence relations' (notions of independence) for complete first-order theories is presented, the principal examples being forking (due to Shelah) and thorn-forking (due to Onshuus). Thorn-forking is characterised in terms of modular pairs in the lattice of algebraically closed sets. Wherever possible, forking and thorn-forking are treated in a uniform way. They are dual in the sense that forking is the finest (most restrictive) and thorn-forking the coarsest independence relation worth examining. We finish by defining the kernel of a sequence of indiscernibles and studying its relation to canonical bases.