computation-theory

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How to tell if a machine is Turing machine equivalent

I found a Wikipedia article of a list of Turing machine equivalents. However, it doesn\'t tell a method of how to determine whether a given machine is Turing machine equivalent.[详细]

2023-02-03 04:21 分类：问答
Example problems not in P nor in NP-complete but in NP

I have a course called Algorithm Analysis at college, where we\'re currently studying the different complexity classes -- P, NP, NP-hard etc.[详细]

2023-01-30 12:56 分类：问答
Understanding TM Simulator

I was just looking at the turing machine simulator code and came across the following statements \"The tape maps time and position to symbols. To calculate the symbol, we have to look at t开发者_Stac[详细]

2023-01-30 07:36 分类：问答
What is the sum of a sum?

Σ from i=1 to n of(n)(n+1)/2 What is the upper limit of computation for a give n? is it O(n^3) O(n^2)?[详细]

2023-01-28 06:27 分类：问答
Pumping Lemma in context-free languages

A = {0^a 1^b 2^c | a &开发者_运维技巧lt; b < c} I need to show that A is not context-free. I\'m guessing I have to use the Pumping Lemma for this, but how?The goal is to prove that for any string[详细]

2023-01-23 05:54 分类：问答
Does Provable == Decidable?

In computation theory are the terms Provable and Decidable interchangable?Do they mean the same thing?[详细]

2023-01-19 10:33 分类：问答
How to get DFA intersection?

H开发者_运维问答ow do we combine two dfa using intersection method ?Use the cross product construction, explained formally here.[详细]

2023-01-04 21:11 分类：问答
Regular Expression for numerical constant

In Sipser\'s book of Theory of computation, following is given : a numerical constant that may include a fractional part[详细]

2023-01-04 09:11 分类：问答
Why is this an invalid Turing machine? [closed]

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.[详细]

2022-12-22 23:25 分类：问答
NFA to DFA question

First, this is not a question asking for the algorithm to convert a NFA to DFA. It\'s known (and proved) that the equivalent DFA of a NFA has at most 2n states, even though most of the times it will[详细]

2022-12-15 22:03 分类：问答