On quasi-unilateral universal Turing machines

نویسنده

  • Maurice Margenstern
چکیده

Four universal Turing machines are given with strong limitations on the number of left instructions in their program. One of the machines is morever non-erasing, i.e. it does not erase any 1 written on the tape. c © 2001 Elsevier Science B.V. All rights reserved.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Some improvements in fuzzy turing machines

In this paper, we improve some previous definitions of fuzzy-type Turing machines to obtain degrees of accepting and rejecting in a computational manner. We apply a BFS-based search method and some level’s upper bounds to propose a computational process in calculating degrees of accepting and rejecting. Next, we introduce the class of Extended Fuzzy Turing Machines equipped with indeterminacy s...

متن کامل

Towards Methods for Discovering Universal Turing Machines (or How Universal Unicorns can be Discovered, not Created)

Universal Turing machines are a well-known concept in computer science. Most often, universal Turing machines are constructed by humans, and designed with particular features in mind. This is especially true of recent efforts to find small universal Turing machines, as these are often the product of sophisticated human reasoning. In this paper we take a different approach, in that we investigat...

متن کامل

Are there intelligent Turing machines?

This paper introduces a new computing model based on the cooperation among Turing machines called orchestrated machines. Like universal Turing machines, orchestrated machines are also designed to simulate Turing machines but they can also modify the original operation of the included Turing machines to create a new layer of some kind of collective behavior. Using this new model we can define so...

متن کامل

Small Weakly Universal Turing Machines

We give small universal Turing machines with state-symbol pairs of (6, 2), (3, 3) and (2, 4). These machines are weakly universal, which means that they have an infinitely repeated word to the left of their input and another to the right. They simulate Rule 110 and are currently the smallest known weakly universal Turing machines. Despite their small size these machines are efficient polynomial...

متن کامل

Remarks on the computational complexity of small universal Turing machines

This paper surveys some topics in the area of small universal Turing machines and tag systems. In particular we focus on recent results concerning the computational complexity of such machines.

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Theor. Comput. Sci.

دوره 257  شماره 

صفحات  -

تاریخ انتشار 2001