Examples of using Computable function in English and their translations into Greek
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Computer
Computable function.
B is the range of a total computable function.
Every computable function has a finite procedure giving explicit, unambiguous instructions on how to compute it.
The greatest common divisor of two numbers is a computable function.
Possible values for a total computable function f arranged in a 2D array.
Lambda calculus can be used to define what is a computable function.
Because f is assumed to be a total computable function, any element of the array can be calculated using f.
The image of a computable set under a nondecreasing total computable function is computable. .
For a total computable function f{\displaystyle f} complexity classes of computable functions can be defined as.
The preimage of a recursive set under a total computable function is a recursive set.
Thus every computable function must have a finite program that completely describes how the function is to be computed.
A set is recursive if andonly if it is either the range of a nondecreasing total computable function or the empty set.
Before the precise definition of computable function, mathematicians often used the informal term effectively calculable.
Many equivalent models of computation are known, andthey all give the same definition of computable function(or a weaker version, in some instances).
As with the concept of a computable function relative computability can be given equivalent definitions in many different models of computation.
This set is recursively enumerable,which means there is a computable function that lists all of the pairs(i, x) it contains.
Completely analogous a partial function is lower semicomputable iff is upper semicomputable orequivalently if there exists a computable function such that.
The proof proceeds by directly establishing that no total computable function with two arguments can be the required function h.
The Church- Turing thesis states that any function computable from a procedure possessing the three properties listed above is a computable function.
Lambda calculus is universal in the sense that any computable function can be expressed and evaluated using this formalism.
Many degrees with special properties were constructed: hyperimmune-free degrees where every function computable relative to that degree is majorized by a(unrelativized) computable function;
The proof proceeds by directly establishing that every total computable function with two arguments differs from the required function h.
In computability theory, a semicomputable function is a partial function f: Q→ R{\displaystyle f:\mathbb{Q}\rightarrow\mathbb{R}}that can be approximated either from above or from below by a computable function.
Enderton[1977] gives the following characteristics of a procedure for computing a computable function; similar characterizations have been given by Turing[1936], Rogers[1967], and others.
The notion of computability of a function can be relativized to an arbitrary set of natural numbers A. A function f is defined to be computable in A(equivalently A-computable or computable relative to A)when it satisfies the definition of a computable function with modifications allowing access to A as an oracle.
Some coding system must be developed to allow a computable function to take an arbitrary word in the language as input; this is usually considered routine.
The following facts are often taken as evidence for the thesis: Many equivalent models of computation are known, andthey all give the same definition of computable function(or a weaker version, in some instances).
In computability theory,a semicomputable function is a partial function that can be approximated either from above or from below by a computable function.
More precisely a partial function is upper semicomputable,meaning it can be approximated from above, if there exists a computable function, where is the desired parameter for and is the level of approximation, such that.
A function f is defined to be computable in A(equivalently A-computable or computable relative to A)when it satisfies the definition of a computable function with modifications allowing access to A as an oracle.