Примери коришћења Arithmetical hierarchy на Енглеском и њихови преводи на Српски
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These type of sets can be classified using the arithmetical hierarchy.
The arithmetical hierarchy assigns classifications to the formulas in the language of first-order arithmetic.
There are two ways that a subset of Baire space can be classified in the arithmetical hierarchy.
The lightface Borel hierarchy extends the arithmetical hierarchy to include additional Borel sets.
Post's theorem shows that RE, together with its complement co-RE,correspond to the first level of the arithmetical hierarchy.
It is possible to define the arithmetical hierarchy of formulas using a language extended with a function symbol for each primitive recursive function.
The Turing computable sets of natural numbers are exactly the sets at level Δ 1 0{\displaystyle\Delta_{1}^{0}} of the arithmetical hierarchy.
The arithmetical hierarchy is important in recursion theory, effective descriptive set theory, and the study of formal theories such as Peano arithmetic.
It gives a finer classification of some sets of natural numbers that are at level Δ 1 0{\displaystyle\Delta_{1}^{0}} of the arithmetical hierarchy.
The hyperarithmetical hierarchy andthe analytical hierarchy extend the arithmetical hierarchy to classify additional formulas and sets.
Instead of formulas with one free variable,formulas with k free number variables are used to define the arithmetical hierarchy on sets of k-tuples of natural numbers.
A parallel definition is used to define the arithmetical hierarchy on finite Cartesian powers of Baire space or Cantor space, using formulas with several free variables.
There are close relationships between the Turing degree of a set of natural numbers andthe difficulty(in terms of the arithmetical hierarchy) of defining that set using a first-order formula.
In mathematical logic, the arithmetical hierarchy, arithmetic hierarchy or Kleene-Mostowski hierarchy classifies certain sets based on the complexity of formulas that define them.
This fact creates a hierarchy of machines,called the arithmetical hierarchy, each with a more powerful halting oracle and an even harder halting problem.
The arithmetical hierarchy can be defined on any effective Polish space; the definition is particularly simple for Cantor space and Baire space because they fit with the language of ordinary second-order arithmetic.
Post's theorem establishes a close relationship between the Turing jump operation and the arithmetical hierarchy, which is a classification of certain subsets of the natural numbers based on their definability in arithmetic.
The polynomial hierarchy is a"feasible resource-bounded" version of the arithmetical hierarchy in which polynomial length bounds are placed on the numbers involved(or, equivalently, polynomial time bounds are placed on the Turing machines involved).
These studies include approaches to investigate the analytical hierarchy which differs from the arithmetical hierarchy by permitting quantification over sets of natural numbers in addition to quantification over individual numbers.