arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.4611cs.LO
收藏

从名义集合到函数的绑定和抽象:连接置换模型逻辑与函数逻辑

From nominal sets binding to functions and lambda-abstraction: connecting the logic of permutation models with the logic of functions

Gilles Dowek, Murdoch Gabbay

摘要:

允许-名义逻辑(Permissive-Nominal Logic,PNL)是一阶谓词逻辑的扩展,它包含了可以在其参数中绑定名称的项形成器。它在(许可的)名义集合中采用语义。在PNL中,形式量词或形式结合符只是满足公理的项形成符,它们的表示是名义原子抽象上的函数。然后我们有高阶逻辑(HOL)和它在普通集合(即Zermelo-Fraenkel)中的模型; forall或lambda的表示是全函数空间或部分函数空间上的函数。这就提出了以下问题:这两种绑定模型是如何连接的?在PNL和HOL之间,以及在名义集合和函数之间,什么样的转换是可能的?我们展示了翻译的PNL到HOL,并从模型的PNL到某些模型的HOL。这是自然的,但也是部分的:我们将一个受限制的子系统完整的PNL HOL。不平移的额外部分是名义集合关于置换的对称性。使用一点名义上的行话:我们可以翻译名称和绑定,但不能翻译它们的名义等变性。这似乎是合理的,因为HOL和普通集合不是等变的。因此,通过这种翻译,PNL和HOL和他们的模型做不同的事情,但他们享受非平凡和丰富的子系统是同构的。

英文摘要:

Permissive-Nominal Logic (PNL) extends first-order predicate logic with term-formers that can bind names in their arguments. It takes a semantics in (permissive-)nominal sets. In PNL, the forall-quantifier or lambda-binder are just term-formers satisfying axioms, and their denotation is functions on nominal atoms-abstraction. Then we have higher-order logic (HOL) and its models in ordinary (i.e. Zermelo-Fraenkel) sets; the denotation of forall or lambda is functions on full or partial function spaces. This raises the following question: how are these two models of binding connected? What translation is possible between PNL and HOL, and between nominal sets and functions? We exhibit a translation of PNL into HOL, and from models of PNL to certain models of HOL. It is natural, but also partial: we translate a restricted subsystem of full PNL to HOL. The extra part which does not translate is the symmetry properties of nominal sets with respect to permutations. To use a little nominal jargon: we can translate names and binding, but not their nominal equivariance properties. This seems reasonable since HOL---and ordinary sets---are not equivariant. Thus viewed through this translation, PNL and HOL and their models do different things, but they enjoy non-trivial and rich subsystems which are isomorphic.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑