Bilinear spaces over a fixed field are simple unstable
Bilinear spaces over a fixed field are simple unstable
复制标题
固定域上的双线性空间是简单不稳定的
DOI:
10.1016/j.apal.2023.103268
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发表时间:
2023
影响因子:
0.8
通讯作者:
Kamsma M
中科院分区:
文献类型:
--
作者:
Kamsma M
We study the model theory of vector spaces with a bilinear form over a fixed field. For finite fields this can be, and has been, done in the classical framework of full first-order logic. For infinite fields we need different logical frameworks. First we take a category-theoretic approach, which requires very little set-up. We show that linear independence forms a simple unstable independence relation. With some more work we then show that we can also work in the framework of positive logic, which is much more powerful than the category-theoretic approach and much closer to the classical framework of full first-order logic. We fully characterise the existentially closed models of the arising positive theory. Using the independence relation from before we conclude that the theory is simple unstable, in the sense that dividing has local character but there are many distinct types. We also provide positive version of what is commonly known as the Ryll-Nardzewski theorem forω-categorical theories in full first-order logic, from which we conclude that bilinear spaces over a countable field areω-categorical.
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影响因子:
1
作者:
Levon Haykazyan;Jonathan Kirby
通讯作者:
Jonathan Kirby
DOI:
--
发表时间:
2020
期刊:
Journal of Symbolic Logic (JSL)
影响因子:
--
作者:
M. Kamsma
通讯作者:
M. Kamsma
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
Itay Ben
通讯作者:
Itay Ben
影响因子:
0.9
作者:
Itay Ben
通讯作者:
Itay Ben
DOI:
10.1163/_afco_asc_2206
发表时间:
2021-06
期刊:
--
影响因子:
--
作者:
Cambridge University Press
通讯作者:
Cambridge University Press