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arXiv 2001.06138math.LO
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逻辑统一的顺序演算

Sequent calculi for a unity of logic

Norihiro Yamada

摘要:

我们提出了一个新的统一的逻辑,即,一个单一的微积分,体现了经典,直觉和线性逻辑。具体地说,我们定义了经典线性逻辑否定(CLL $^-$),它是一种新的逻辑,它是经典的、线性的,但摒弃了经典线性逻辑中的极性和严格的德摩根定律。然后,我们定义了非线性化和经典化的微积分,使得非线性化映射CLL $^-$(分别为)。直觉线性逻辑(ILL))到经典逻辑(CL)(分别直觉主义逻辑(IL)),和经典化地图IL(分别。ILL)至CL(分别为CLL $^-$)模保守扩张。通过这两个映射,只有ILL的保守扩张的微积分才能满足ILL,IL,CLL $^-$和CL。这一结果实现了一个简单的,高度系统化的逻辑统一,通过丢弃极性和严格的德摩根定律,其中(可以说)只有CLL,并包括统一的经典化和非线性化,其中交换。以前的方法不能满足这些要求。我们的统一也澄清了直觉性和经典性之间的二分法,以及逻辑的线性和非线性之间的二分法,它们是对称的。

英文摘要:

We present a novel unity of logic, viz., a single sequent calculus that embodies classical, intuitionistic and linear logics. Concretely, we define classical linear logic negative (CLL$^-$), a new logic that is classical and linear yet discards the polarities and the strict De Morgan laws in classical linear logic (CLL). Then, we define unlinearisation and classicalisation on sequent calculi such that unlinearisation maps CLL$^-$ (resp. intuitionistic linear logic (ILL)) to classical logic (CL) (resp. intuitionistic logic (IL)), and classicalisation maps IL (resp. ILL) to CL (resp. CLL$^-$) modulo conservative extensions. By these two maps, only a sequent calculus for a conservative extension of ILL suffices for ILL, IL, CLL$^-$ and CL. This result achieves a simple, highly systematic unity of logic by discarding the polarities and the strict De Morgan laws, which (arguably) only CLL has, and consisting of the uniform classicalisation and unlinearisation, which commute. Previous methods do not satisfy these points. Our unity also clarifies the dichotomies between intuitionisity and classicality, and between linearity and non-linearity of logic, which are symmetric.

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