Time-symmetric Turing machines for computable involutions
Time-symmetric Turing machines for computable involutions
复制标题
用于可计算对合的时间对称图灵机
DOI:
10.1016/j.scico.2021.102748
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发表时间:
2022
影响因子:
1.3
通讯作者:
Nakano Keisuke
中科院分区:
文献类型:
--
作者:
清野航;廣田佳久;Nakano Keisuke
A reversible Turing machine is a forward and backward deterministic Turing machine, which has been an expressive model of reversible computation. It is obvious that every reversible Turing machine computes an injective function under a function semantics in which the initial and the final configuration of a run corresponds to an input and an output of the function. Axelsen and Glück showed the opposite direction that every injective computable function can be computed by a reversible Turing machine. This paper provides a similar result on involutions instead of injective functions. An involution, also called a self-inverse function, is a function f that is its own inverse, ie, f (f (x))= x holds whenever f (x) is defined. The paper presents a computational model of involution as a variant of Turing machines, called a time-symmetric Turing machine. The computational model is shown to be expressive in the sense that not only does a time-symmetric Turing machine always compute an involution but also every computable involution can be computed by a time-symmetric Turing machine. As any involution is injective (hence reversible), any time-symmetric Turing machine is a reversible Turing machine. Furthermore, the existence of a universal time-symmetric Turing machine is shown under an appropriate redefinition of universality introduced by Axelsen and Glück for reversible Turing machines.
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影响因子:
0.5
作者:
D. Zagier
通讯作者:
D. Zagier
DOI:
--
发表时间:
2004
期刊:
16th Nordic Workshop on Programming Theory. Proceedings
影响因子:
--
作者:
真田貴志;池田和美;保倉明子;中井 泉;池田 和美;真道 洋子(編);久保田 静香;久保田 静香;久保田 静香;Masahiko Kawabe;河邊 昌彦;Masahiko Kawabe
通讯作者:
Masahiko Kawabe
影响因子:
0.6
作者:
Axelsen, Holger Bock;Gluck, Robert
通讯作者:
Gluck, Robert
影响因子:
1.1
作者:
Gajardo, Anahi;Kari, Jarkko;Moreira, Andres
通讯作者:
Moreira, Andres