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Elementary Linear Logic Revisited for Polynomial Time and an Exponential Time Hierarchy

机译:再谈多项式时间和指数时间层次的基本线性逻辑

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Elementary linear logic is a simple variant of linear logic, introduced by Girard and which characterizes in the proofs-as-programs approach the class of elementary functions, that is to say computable in time bounded by a tower of exponentials of fixed height. Our goal here is to show that despite its simplicity, elementary linear logic can nevertheless be used as a common framework to characterize the different levels of a hierarchy of deterministic time complexity classes, within elementary time. We consider a variant of this logic with type fix-points and weakening. By selecting specific types we then characterize the class P of polynomial time predicates and more generally the hierarchy of classes k-EXP, for k ≥ 0, where k-EXP is the union of DTIME(2_k~n~i), for i ≥ 1.
机译:基本线性逻辑是线性逻辑的一种简单变体,由Girard引入,其特征是在程序证明中逼近基本函数的类别,也就是说,可以在固定高度的指数塔的范围内进行时间计算。我们的目标是表明,尽管简单,基本线性逻辑仍可以用作通用框架,以描述基本时间内确定性时间复杂度类的层次结构的不同级别。我们考虑这种逻辑的变体,它具有类型固定点和弱化类型。通过选择特定的类型,我们然后表征多项式时间谓词的类P,并且更普遍地描述k-EXP类的层次,对于k≥0,其中k-EXP是DTIME(2_k〜n〜i)的并集,对于i≥ 1。

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