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arXiv 2107.05912math.LO
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剩余结构簇中的满射

Epimorphisms in varieties of residuated structures

G. Bezhanishvili, T. Moraschini, J. Raftery

摘要:

证明了满射在一系列剩余结构中是满射的,包括有限深度的Heyting或Brouwerian代数的所有变种,以及Goedel代数、相关Stone代数、Sugihara幺半群或正Sugihara幺半群的所有变种.这为相应的子结构逻辑范围建立了无限演绎Beth可定义性。另一方面,它表明,满射不需要在一个局部有限的各种宽度为2的Heyting或Brouwerian代数满射。因此,无限Beth性质严格强于所谓的有限Beth性质,证实了Blok和Hoogland的猜想。

英文摘要:

It is proved that epimorphisms are surjective in a range of varieties of residuated structures, including all varieties of Heyting or Brouwerian algebras of finite depth, and all varieties consisting of Goedel algebras, relative Stone algebras, Sugihara monoids or positive Sugihara monoids. This establishes the infinite deductive Beth definability property for a corresponding range of substructural logics. On the other hand, it is shown that epimorphisms need not be surjective in a locally finite variety of Heyting or Brouwerian algebras of width 2. It follows that the infinite Beth property is strictly stronger than the so-called finite Beth property, confirming a conjecture of Blok and Hoogland.

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