# Non computable problems examples

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Concrete **examples** of total, uncomputable **function** are easy: The most famous is the halting **problem**, where the input is a macine/input pair ( M, x) and the output is 0 or 1, depending on whether M halts on x or not (there are some variations in this definition but all in the same spirit)..

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Web. 1 **Problems** in logic 2 **Problems** about abstract machines 3 **Problems** about matrices 4 **Problems** in combinatorial group theory 5 **Problems** in topology 6 **Problems** in analysis 7 **Problems** about formal languages and grammars 8 Other **problems** 9 See also 10 Notes 11 Bibliography 12 Further reading 13 External links **Problems** in logic [ edit].

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Note: if you use a text editor that understands markup, the text file will be nicely formatted. **Examples** of such editors include Ulysses, Typora, Draft, IA Writer, Obsidian. (The second part of this publication with all 2008-2022 articles will come out in a few months). Continue Reading. Download Free PDF. **Non-computable** functions ... Ifintheprocessofsolving a more general **problem**, one is faced with such an intrinsically hard **problem**, it is a sign that the goals of the general **problem** need reﬁnement. Maybe it is enough to only consider ... For **example**, there are countably many **computable** functions, because for a.

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Oct 11, 2009 · One **example**, that always pops to one's mind when asked about **non** **computable** **problems**, is the Halting **Problem**. This **problem** is fairly simple "Given a program and an input to the program, find whether the program will run indefinitely or not when processing that input" in other words find if a certain input will cause a program to enter an ....

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Web. Web. Features: If a **problem** X is in NP, then its complement X' is also is in CoNP. For an NP and CoNP **problem**, there is no need to verify all the answers at once in polynomial time, there is a need to verify only one particular answer "yes" or "no" in polynomial time for a **problem** to be in NP or CoNP.29-Jul-2022.

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Apr 07, 2017 · As for the real world, just note that real computers have finite precision, so basically any physics **problem** is not **computable**, quite trivially so. $\endgroup$ – Raphael ♦ Apr 7, 2017 at 19:08.

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Web. . Sep 26, 2019 · Striking **examples** are the computer assisted proof of Kepler’s conjecture (Hales et al) on optimal packing of 3-spheres, and the computer assisted proof of the of the Dirac-Schwinger conjecture (Fefferman and Seco) on the asymptotic behaviour of the ground-state energy of certain Schrodinger operators..

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Sep 14, 2022 · Clearly there are only countable many numbers that satisfy this weaker definition, but I haven't been able to find any **examples** of numbers that don't satisfy my definition. All of the **examples** of uncomputable numbers I know use the halting **problem** in some way, and they are uncomputable because you can't know for sure how close you are to the .... We present three different ways of getting an actually **computable** enumeration Q+ ... As we see the **problem**, its nature is intimately related to the representation of rational numbers. The basic ... used for the **non**-alternated expansions (Engel's series) developed in 1936 by Bore1 (1936), [l], and Levy, see [9], and later by Erdos et u[..

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Web. Bob Marks's delightful **Non-Computable** You offers a well-reasoned rebuttal. So be human, be creative!"-Gregory Chaitin, algorithmic information theory pioneer and discoverer of Chaitin's number "Bob Marks's **Non-Computable** You throws a big bucket of informed cold water on the runaway brushfire of Big-Tech hype that makes up far too much of modern.

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Web. Web. This question asks about NP-hard **problems** that are not NP-complete. I'm wondering if there exist any decision **problems** that are neither NP nor NP-hard. ... I'm more interested in **non**-NP-hard **problems**. Specifically those that are **non**-NP. $\endgroup$ - Sebastian Goodman. Apr 4, 2013 at 18:53. ... As this language is not **computable**, it is.

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Most famous **example** of a **non**-computablity (or undecidability) is the Halting **Problem**. Given a description of a Turing machine and its initial input, determine whether the program, when executed on this input, ever halts (completes). The alternative is that it runs forever without halting.

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**Example** B: The Busy Beaver **Problem** BB(n) Tibor Radó in a 1962 paper entitled "On **Non-Computable** Functions" posed the following **problem**: What is the largest finite number of 1s that can be produced on blank tape using a Turing machine with n states? The **problem** has later come to be known as the Busy Beaver **problem**. If you mean a **problem** that seemingly runs forever, those **problems** do have solutions, but we're never going to see them. For **example**, Ackermann recursion for large numbers is a **problem** with "no solution" because after 3 recursions it takes days for the next answer, the 5th takes weeks and it grows exponentially after that. Web.

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For **example** to find the last item in a list might require you to scan the entire list and this would take a time proportional to the length of the list N. Next best is a quadratic time algorithm where it take N 2 to get the job done.

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Web. What are **non-computable** **problems**? In computability theory, ... Chaitin's constant is an **example** (actually a family of **examples**) of a **non-computable** number. It represents the probability that a randomly-generated program (in a certain model) will halt. It can be calculated approximately, but there is (provably) no algorithm for calculating it.

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Web. Jun 14, 2017 · You're right that if the English language (or any other finite language) is used you get a **computable** number. Denis's **example** is not the English language, though: it's the language that encodes the halting **problem**. That is, this "language" consists of all words that are encodings of Turing machines that halt..

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What **problems** are not **computable**? A **non-computable** is a **problem** for which there is no algorithm that can be used to solve it. An **example** of a **non-computable** is the halting **problem**.Hyper computation is more powerful than a Turing Machine and has the capability of solving **problems** that the Turing Machine can't. A **non**-**computable** is a **problem** for which there is no algorithm that can be used to solve it. An **example** of a **non**-**computable** is the halting **problem**. Hyper computation is more powerful than a Turing Machine and has the capability of solving **problems** that the Turing Machine can’t.. **Problem** -Reduction : If P 1 reduced to P 2, Then P2 is at least as hard as P1. Theorem: If P 1 reduces to P 2 then, • If P1 is undecidable the so is P2. • If P 1 is **Non**-RE then so is P 2. Post' s Correspondence **Problem** ( PCP) Proof: The halting **problem** of turning machine can be reduced to PCP to show the undecidability of PCP.. Web.

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Sep 26, 2019 · Striking **examples** are the computer assisted proof of Kepler’s conjecture (Hales et al) on optimal packing of 3-spheres, and the computer assisted proof of the of the Dirac-Schwinger conjecture (Fefferman and Seco) on the asymptotic behaviour of the ground-state energy of certain Schrodinger operators.. Routledge Advances In Experimental And **Computable** Economics, but end up in infectious downloads. Rather than enjoying a good book with a cup of coffee in the afternoon, instead they cope with some malicious bugs inside their laptop. Classical Econophysics Routledge Advances In Experimental And **Computable** Economics is available in our digital.

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Computability - Tractable, Intractable and **Non-computable** Function 1. ... the **problem** is called undecidable. **Example**: oGiven any set of any number of different tile designs (**examples** shown above), with an infinite number of each type of tile, can we tile any area with these tiles so that like colored edges touch? oThis **problem** is undecidable!.

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non-computablein the context of a decisionproblem, whose answer (or output) is either “true” or “false”).Non-ComputableProblems– Anon-computableis aproblemfor which there is no algorithm that can be used to solve it. Most famousexampleof anon-computablity (or undecidability) is the HaltingProblem.Non-ComputableProblems.Non-computableproblemsdescribe an. algorithmproblemthat admits no algorithm. The best knownexampleinvolves the Halting Probem for a Turing Machine. The HaltingProblemis to simply write a program. that examines other programs to determine. if they halt or loop forever, when fed into themselves as input.examples: A trivial one: while (true) {} A more practical one: A web server that continually listens for requests, processes them, then returns the results. Each request may be finite but the web server itself is in an infinite polling loop. Programs that implement "solutions" to undecidableproblems. Consider the haltingproblem.non-computablein the context of a decisionproblem, whose answer (or output) is either “true” or “false”).Non-ComputableProblems– Anon-computableis aproblemfor which there is no algorithm that can be used to solve it. Most famousexampleof anon-computablity (or undecidability) is the HaltingProblem.