A Foundational Delineation of Poly-time

A Foundational Delineation of Poly-time
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多时间的基本描述

DOI:
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发表时间:
1994
影响因子:
1
通讯作者:
D. Leivant
D. Leivant
中科院分区:
计算机科学4区
文献类型:
--
作者:
D. Leivant

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我们证明了一个在{0,1}* 上的函数是多时间的当且仅当它是由一个方程程序计算的,该方程程序可以被证明在构造性二阶逻辑中处处收敛,其中集合存在(理解)限制于正的无量词公式,或者对于正的存在公式具有集合存在。这些集合存在原则传达了一种无限集合的本体论,它是进化的,而不是完成的,整体。因此,我们的表征结果可以被视为一个基本的理由,确定多时间的可行性。
We show that a function over {0, 1}* is poly-time iff it is computed by an equational program which can be proved to be everywhere converging in constructive second-order logic with set-existence (comprehension) restricted to positive quantifier-free formulas, or alternatively with set-existence for positive existential formulas. These set-existence principles convey an ontology of infinite sets as evolving, not completed, totalities. Our characterization results can consequently be viewed as a foundational justification for identifying poly-time with feasibility.