Lindenbaum and Pair Extension Lemma in Infinitary Logics
Lindenbaum and Pair Extension Lemma in Infinitary Logics
复制标题
无限逻辑中的 Lindenbaum 和对扩展引理
DOI:
10.1007/978-3-662-57669-4_7
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Lávička
中科院分区:
文献类型:
--
作者:
Bílková M;Cintula;Lávička
The abstract Lindenbaum lemma is a crucial result in algebraic logic saying that the prime theories form a basis of the closure systems of all theories of an arbitrary given logic. Its usual formulation is however limited to finitary logics, i.e., logics with Hilbert-style axiomatization using finitary rules only. In this contribution, we extend its scope to all logics with a countable axiomatization and a well-behaved disjunction connective. We also relate Lindenbaum lemma to the Pair extension lemma, other well-known result with many applications mainly in the theory of non-classical modal logics. While a restricted form of this lemma (to pairs with finite right-hand side) is, in our context, equivalent to Lindenbaum lemma, we show a perhaps surprising result that in full strength it holds for finitary logics only. Finally we provide examples demonstrating both limitations and applications of our results.
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