Exemplos de uso de Primitive recursion em Inglês e suas traduções para o Português
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At first glance the equations seem to be using primitive recursion.
Ψ( x, z-1,z-1):"Σ is actually a primitive recursion with the base Σ(x, 0) 0 and the induction step Σ(x, y+1) Σ( x, y)+ Π x, y.
The smallest class of functions including the initial functions andclosed under composition and primitive recursion i.e.
The product Π is also a primitive recursion Π with base step Π( x, 0) ψ( x, 0) and induction step Π( x, y+1) Π( x, y)*ψ x, y+1.
Then induction on S is the usual mathematical induction, andrecursion on S gives primitive recursion.
The unbounded search operator is not definable by the rules of primitive recursion as those do not provide a mechanism for"infinite loops" undefined values.
They are the smallest class of partial functions that includes the initial functions andis closed under composition, primitive recursion, and the μ operator.
Soare proposes that the origination of"primitive recursion" began formally with the axioms of Peano, although"Well before the nineteenth century mathematicians used the principle of defining a function by induction.
Thus the Grzegorczyk hierarchy can be seen as a way to limit the power of primitive recursion to different levels.
In a category with exponentials, using the isomorphism formula_20(in computer science, this is called currying),the Ackermann function may be defined via primitive recursion over higher-order functionals as follows: :formula_21where"Succ" is the usual successor function and"Iter" is defined by primitive recursion as well: :formula_22One interesting aspect of the Ackermann function is that the only arithmetic operations it ever uses are addition and subtraction of 1.
Hasegawa later developed kappa calculus into a usable(though simple)programming language including arithmetic over natural numbers and primitive recursion.
The smallest class of functions including the initial functions andclosed under composition and primitive recursion(i.e. without minimisation) is the class of primitive recursive functions.
The use of Turing machines here is not necessary; there are many other models of computation that have the same computing power as Turing machines;for example the μ-recursive functions obtained from primitive recursion and the μ operator.
Here he developed the arithmetic of the natural numbers by first defining objects by primitive recursion, then devising another system to prove properties of the objects defined by the first system.
Each entry in this sequence needs to be an application of a basic function orfollow from the entries above by using composition, primitive recursion or μ-recursion.
An important application of the propositions as types principle is the identification of(dependent) primitive recursion and induction by one elimination constant: :formula_26for any given type formula_27 indexed by formula_28.
Recursive function may refer to:*Recursion(computer science), a procedure or subroutine, implemented in a programming language, whose implementation references itself*A total computable function, a function which is defined for all possible inputs* Primitive recursive function==See also==*μ-recursive function,defined from a particular formal model of computable functions using primitive recursion and the μ operator*Recurrence relation, in mathematics, an equation that defines a sequence recursively.
This enumeration uses the definitions of the primitive recursive functions(which are essentially just expressions with the composition and primitive recursion operations as operators and the basic primitive recursive functions as atoms), and can be assumed to contain every definition once, even though a same function will occur many times on the list since many definitions define the same function; indeed simply composing by the identity function generates infinitely many definitions of any one primitive recursive function.
As a companion to his fifth axiom, mathematical induction, Peano used definition by induction,which has been called primitive recursion(since Péter 1934 and Kleene 1936)….
Gabriel Sudan(1927) and Wilhelm Ackermann(1928)display recursive functions that are not primitive recursive:"Are there recursions that are not reducible to primitive recursion; and in particular can recursion be used to define a function which is not primitive recursive?
The definitions of elementary recursive functions are the same as for primitive recursive functions, except that primitive recursion is replaced by bounded summation and bounded product.
The β function is used, in particular,in showing that the class of arithmetically definable functions is closed under primitive recursion, and therefore includes all primitive recursive functions.
Many also believe that allof finitism is captured by PRA, but others believe finitism can be extended to forms of recursion beyond primitive recursion, up to ε0, which is the proof-theoretic ordinal of Peano arithmetic.