Table of Contents
Can a Turing machine do everything a computer can?
While this is just one example, computability theory also holds the key to why computers really can’t do everything. Given that undecidable problems cannot be solved by any Turing Machine, and since all of today’s computers are simply complex Turing Machines, it is clear that computers cannot do everything!
Can a Turing machine simulate a computer?
A Turing machine is a hypothetical machine thought of by the mathematician Alan Turing in 1936. Despite its simplicity, the machine can simulate ANY computer algorithm, no matter how complicated it is!
Are all computers Turing machines?
No. Modern computers are most notably bounded by finite memory. There are many ways to construct abstract machines with various subsets of their functionality / programmability, which leads to frequently seen whitepapers about how X or Y is Turing complete.
What is halting problem of Turing machine?
The halting problem is a decision problem about properties of computer programs on a fixed Turing-complete model of computation, i.e., all programs that can be written in some given programming language that is general enough to be equivalent to a Turing machine.
Can Turing machines simulate quantum computers?
Yes, a quantum computer could be simulated by a Turing machine, though this shouldn’t be taken to imply that real-world quantum computers couldn’t enjoy quantum advantage, i.e. a significant implementation advantage over real-world classical computers.
Can Universal Turing Machine simulate itself?
So Turing machines can have themselves as input. So they can simulate themselves(this technique have been used in many proofs i saw).
Are digital computers Turing machines?
Today’s electronic digital computers are often referred to as universal Turing machines. That is, the concept of the UTM is used to understand today’s stored-program electronic digital computers.
Is the halting problem in NP?
There are decision problems that are NP-hard but not NP-complete such as the halting problem. It is also easy to see that the halting problem is not in NP since all problems in NP are decidable in a finite number of operations, but the halting problem, in general, is undecidable.
Why is halting problem unsolvable?
A key step in showing that incompleteness is natural and pervasive was taken by Alan M. Turing in 1936, when he demonstrated that there can be no general procedure to decide if a self-contained computer program will eventually halt.
Is my laptop a universal Turing machine?
4 Answers. You’re right that physical computers have finite memory and so are not Turing-complete.
Can a Turing machine randomly solve NP problems?
An incarnation of a nondeterministic Turing machine that randomly chooses and examines (or assembles) the next potential solution will solve an NP problem in polynomial time with some probability (it would solve the problem in poly time with absolute certainty if it were the “luckiest possible guesser”).
Is a modern computer Turing complete?
A modern computer is Turing complete, generally this term is used with the exception of infinite storage device. In practice, the memory can be quite long. For example, along with being universal function approximators, recurrent neural networks with memory (and running repeatedly) are said to be Turing complete.
Do Turing machines have an infinite amount of memory?
$\\begingroup$Turing machines don’t necessarily have an infinite amount of memory. They just have a sufficient amount of memory to do whatever you want to do. If you limit yourself to halting programs, a Turing machine may as well have finite memory.
How many states are there in a Turing machine?
The model of a Turing Machine consists of infinite memory tape, which means infinite states. But suppose if our PC has 128 MB memory and 30GB disk it would have… Stack Exchange Network