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Concept in mathematical logic
intuitionistic type theory (ITT), a discipline within mathematical logic, induction-recursion is a feature for simultaneously declaring a type and function on
Induction-recursion
Mathematical concept
induction, we may treat different types of ordinals separately: another formulation of transfinite recursion is the following: Transfinite Recursion Theorem
Transfinite_induction
Type of binary relation
successor function x ↦ x+1. Then induction on S is the usual mathematical induction, and recursion on S gives primitive recursion. If we consider the order relation
Well-founded_relation
Process of repeating items in a self-similar way
Recursion occurs when the definition of a concept or process depends on a simpler or previous version of itself. Recursion is used in a variety of disciplines
Recursion
Mathematical constructs and creation rules
defined simultaneously. Universe types can be defined using induction-recursion. Induction-induction allows definition of a type and a family of types at the
Inductive_type
Topics referred to by the same term
Mathematical induction, a method of proof also called "proof by recursion" Recursion, a 2004 science fiction novel by Tony Ballantyne Recursion (Crouch novel)
Recursion_(disambiguation)
Proof method in mathematical logic
mathematical induction over natural numbers and can be further generalized to arbitrary Noetherian induction. Structural recursion is a recursion method bearing
Structural_induction
Form of mathematical proof
structural induction, is used in mathematical logic and computer science. Mathematical induction in this extended sense is closely related to recursion. Mathematical
Mathematical_induction
Mathematical theorem
Transfinite recursion is an instance of transfinite induction and the latter works over a well-ordered set (in fact, the feasibility of such an induction is equivalent
Transfinite_recursion_theorem
Use of functions that call themselves
recursion is a method of solving a computational problem where the solution depends on solutions to smaller instances of the same problem. Recursion solves
Recursion_(computer_science)
Latin phrase meaning 'continuing forever'
up ad infinitum in Wiktionary, the free dictionary. Mathematical induction Recursion Self-reference "The Song That Never Ends" Turtles all the way down
Ad_infinitum
Functional programming language
raw induction principles. In Agda, dependently typed pattern matching is a primitive of the language; the core language lacks the induction/recursion principles
Agda_(programming_language)
Topics referred to by the same term
to: Base case (recursion), the terminating scenario in recursion that does not use recursion to produce an answer Base case (induction), the basis in
Base_case
Kind of transfinite induction
schema of set induction. The principle implies transfinite induction and recursion. It may also be studied in a general context of induction on well-founded
Epsilon-induction
Mathematical theory of data types
types. Two methods of generating inductive types are induction-recursion and induction-induction. A method that only uses lambda terms is Scott encoding
Type_theory
Topics referred to by the same term
Railway Children (band) album Feedback (disambiguation) Mathematical induction Recursion This disambiguation page lists articles associated with the title
Recurrence
Branch of mathematical logic
stronger than arithmetical transfinite recursion and is fully impredicative. It consists of RCA0, plus the induction axiom 0 ∈ X → ∀ n [ n ∈ X → n + 1 ∈
Reverse_mathematics
Algorithms which recursively solve subproblems
they use tail recursion, they can be converted into simple loops. Under this broad definition, however, every algorithm that uses recursion or loops could
Divide-and-conquer_algorithm
Defining elements of a set in terms of other elements in the set
3 etc. The recursion theorem states that such a definition indeed defines a function that is unique. The proof uses mathematical induction. An inductive
Recursive_definition
Subfield of mathematics
mathematics. Major subareas include model theory, proof theory, set theory, and recursion theory (also known as computability theory). Research in mathematical
Mathematical_logic
CiteSeerX 10.1.1.6.4575. doi:10.2307/2586554. JSTOR 2586554. S2CID 18271311. A list of Peter Dybjer's publications on induction and induction-recursion
Induction-induction
Alternative foundation of mathematics
Later work in type theory generated coinductive types, induction-recursion, and induction-induction for working on types with more obscure kinds of self-referentiality
Intuitionistic_type_theory
Generalization of "n-th" to infinite cases
Transfinite induction can be used not only to prove theorems but also to define functions on ordinals. This is known as transfinite recursion. Formally
Ordinal_number
One of several equivalent definitions of a computable function
f_{m}} Primitive Recursion: Kleene uses the symbol R n ( base step , induction step ) {\displaystyle R^{n}({\text{base step}},{\text{induction step}})} where
General_recursive_function
Generalized form of recursion
Bar recursion is a generalized form of recursion developed by C. Spector in his 1962 paper. It is related to bar induction in the same fashion that primitive
Bar_recursion
Function computable with bounded loops
Another restriction considered by Robinson is pure recursion, where h does not have access to the induction variable y: f ( 0 , x 1 , … , x k ) = g ( x 1
Primitive_recursive_function
Mathematical theory
is generated by an unknown algorithm. This is also called a theory of induction. Due to its basis in the dynamical (state-space model) character of Algorithmic
Solomonoff's theory of inductive inference
Solomonoff's_theory_of_inductive_inference
Pattern defining an infinite sequence of numbers
Master theorem (analysis of algorithms) Mathematical induction Orthogonal polynomials Recursion Recursion (computer science) Time scale calculus Jacobson,
Recurrence_relation
Motorcycle model introduced in 2013
The Suzuki Recursion is a turbocharged concept motorcycle shown by Suzuki at the 2013 Tokyo Auto Show. The engine is a 588 cc parallel-twin with intercooled
Suzuki_Recursion
Logic concept
The main tools to prove this result are ordinary and transfinite induction, recursion methods, and ZF set theory (cf. and ). Pluralist theory of truth
Truth_predicate
Mathematical object
endofunctor F. This initiality provides a general framework for induction and recursion. Consider the endofunctor 1 + (−), i.e. F : Set → Set sending X
Initial_algebra
Formalization of the natural numbers
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
Primitive recursive arithmetic
Primitive_recursive_arithmetic
Subdiscipline of formal epistemology
computationally bounded agents. In short, computational epistemology is to induction what recursion theory is to deduction. It has been applied to problems in philosophy
Computational_epistemology
Type of algorithm in computer science
corecursion is a type of operation that is dual to (structural) recursion. Whereas recursion consumes a data structure by first handling the topmost layer
Corecursion
Topics referred to by the same term
absolutely infinite Transfinite induction, an extension of mathematical induction to well-ordered sets Transfinite recursion Transfinite arithmetic, the generalization
Transfinite
Foundational controversy in twentieth-century mathematics
481, footnote a). This is in fact the so-called "induction schema" used in the notion of "recursion" that was still in development at this time (van Heijenoort
Brouwer–Hilbert_controversy
Application of forced induction to a motorcycle engine
Forced induction in motorcycles is the application of forced induction (turbochargers or superchargers) to a motorcycle engine. Special automotive engineering
Forced induction in motorcycles
Forced_induction_in_motorcycles
Set theory concept
one set Vα for each ordinal number α. Vα may be defined by transfinite recursion as follows: Let V0 be the empty set: V 0 := ∅ . {\displaystyle V_{0}:=\varnothing
Von_Neumann_universe
Mathematical system
second-order induction axiom. It would be equivalent to also include the entire arithmetical induction axiom scheme, in other words to include the induction axiom
Second-order_arithmetic
Quickly growing function
stack reflects the recursion depth. As the reduction according to the rules {r4, r5, r7} involves a smaller maximum depth of recursion, this computation
Ackermann_function
Sequence of program instructions invokable by other software
the suspended call's variables. Recursion allows direct implementation of functionality defined by mathematical induction and recursive divide and conquer
Function (computer programming)
Function_(computer_programming)
American mathematician (1926–2026)
D. at the University of Chicago in 1956 for his dissertation "k-fold recursion and well-ordering". He was a student of Saunders Mac Lane. The Howard
William_Alvin_Howard
Axiomatic set theories based on the principles of mathematical constructivism
plus full induction. It implies the recursion principle even for classes and such that g {\displaystyle g} is unique. Already that recursion principle
Constructive_set_theory
Size of a mathematical ball
relation in dimension n. By induction, the proportionality relation is true in all dimensions. A proof of the recursion formula relating the volume of
Volume_of_an_n-ball
2007 book by Nassim Nicholas Taleb
the distinction between fiction and nonfiction, and her book A Story of Recursion. She published her book on the web and was discovered by a small publishing
The Black Swan: The Impact of the Highly Improbable
The_Black_Swan:_The_Impact_of_the_Highly_Improbable
Type of transfinite numbers
epsilon zero), which can be viewed as the "limit" obtained by transfinite recursion from a sequence of smaller limit ordinals: ε 0 = ω ω ω ⋅ ⋅ ⋅ = sup { ω
Epsilon_number
theory of algorithms. Peano axioms Giuseppe Peano Mathematical induction Structural induction Recursive definition Naive set theory Element (mathematics)
List of mathematical logic topics
List_of_mathematical_logic_topics
Generalization of the real numbers
formula involves not only recursion in terms of being able to divide by numbers from the left and right sets of y, but also recursion in that the members of
Surreal_number
Mathematical technique used in proof theory
transfinite recursion. A T R {\displaystyle {\mathsf {ATR}}} is A T R 0 {\displaystyle {\mathsf {ATR}}_{0}} plus the full second-order induction scheme. B
Ordinal_analysis
Rewriting system and type of formal grammar
above to the earlier recursion, one gets: Axiom First recursion Second recursion Third recursion Fourth recursion Seventh recursion, scaled down ten times
L-system
Election result probability theorem
based on a general formula for the number of favourable sequences using a recursion relation. He remarks that it seems probable that such a simple result
Bertrand's_ballot_theorem
class of arithmetically definable functions is closed under primitive recursion, and therefore includes all primitive recursive functions. The β function
Gödel's_β_function
Machine learning algorithm
derived subset in a recursive manner called recursive partitioning. The recursion is completed when the subset at a node has all the same values of the
Decision_tree_learning
Class of mathematical orderings
ISBN 978-0-521-63107-5. [1] Paul Taylor, Towards a unified treatment of induction, I: the general recursion theorem (1996). Remark 2.5. in https://ncatlab.org/nlab/show/Zorn's+lemma
Well-order
Theorem that every set can be well-ordered
For every ordinal α {\displaystyle \alpha } , define by transfinite recursion an element a α {\displaystyle a_{\alpha }} that is in A {\displaystyle
Well-ordering_theorem
Type of mathematical proof
exhaustion, also known as proof by cases, proof by case analysis, complete induction or the brute force method, is a method of mathematical proof in which
Proof_by_exhaustion
Sequence of operations for a task
Undecidable, p. 237ff. Kleene's definition of "general recursion" (known now as mu-recursion) was used by Church in his 1935 paper An Unsolvable Problem
Algorithm
Algorithm for the kth smallest element in an array
overhead if tail call optimization is available, or if eliminating the tail recursion with a loop: function select(list, left, right, k) is loop if left = right
Quickselect
Recursive function for formal verification case testing
function was chosen for being nested-recursive (contrasted with single recursion, such as defining f ( n ) {\displaystyle f(n)} by means of f ( n − 1 )
McCarthy_91_function
Axioms for the natural numbers
could be derived from more basic facts about the successor operation and induction. In 1881, Charles Sanders Peirce provided an axiomatization of natural-number
Peano_axioms
In first-order arithmetic, the induction principles, bounding principles, and least number principles are three related families of first-order principles
Induction, bounding and least number principles
Induction,_bounding_and_least_number_principles
Reasoning for mathematical statements
its name, mathematical induction is a method of deduction, not a form of inductive reasoning. In proof by mathematical induction, a single "base case"
Mathematical_proof
English programmer, venture capitalist, and writer (born 1964)
Hidders, J.; Paredaens, J.; Vercammen, R.; Marrara, S. "Expressive power of recursion and aggregates in XQuery" (PDF). Adrem Data Lab. University of Antwerp
Paul_Graham_(programmer)
System of arithmetic in proof theory
properties of 0, 1, +, ×, x y {\displaystyle x^{y}} , together with induction for formulas with bounded quantifiers. EFA is a very weak logical system
Elementary function arithmetic
Elementary_function_arithmetic
Operations on ordinals that extend classical arithmetic
set that represents the result of the operation or by using transfinite recursion. In addition to these standard operations for ordinals, there are also
Ordinal_arithmetic
Simple programming languages
programming language whose main control flow structure is a bounded loop (i.e. recursion is not permitted[citation needed]). All programs in the language must
BlooP_and_FlooP
Mathematical proposition equivalent to the axiom of choice
directly using transfinite recursion, still assuming the axiom of choice. For that, see for example Transfinite recursion theorem § Example: a basis construction
Zorn's_lemma
Square root of the determinant of a skew-symmetric square matrix
to the first row. This is proved by induction by expanding the determinant on minors and employing the recursion formula below. A = [ 0 a − a 0 ] , pf
Pfaffian
Every polynomial has a real or complex root
The proof that this statement results from the previous ones is done by recursion on n: when a root r 1 {\displaystyle r_{1}} has been found, the polynomial
Fundamental theorem of algebra
Fundamental_theorem_of_algebra
Programming language
lemmas and theorems is standard in Dafny with recursion employed for induction (typically, structural induction). Case analysis is performed using match statements
Dafny
Orthonormalization of a set of vectors
original inputs. A variant of the Gram–Schmidt process using transfinite recursion applied to a (possibly uncountably) infinite sequence of vectors ( v α
Gram–Schmidt_process
Computer science and recursion theory
In computer science and recursion theory the McCarthy formalism (1963) of computer scientist John McCarthy clarifies the notion of recursive functions
McCarthy_Formalism
proofs Gödel's completeness theorem and its original proof Mathematical induction and a proof Proof that 0.999... equals 1 Proof that 22/7 exceeds π Proof
List_of_mathematical_proofs
System of mathematical set theory
x=y\equiv \forall w\in x(w\in y)\land \forall w\in y(w\in x).} Axiom of induction: φ(a) being a formula, if for all sets x the assumption that φ(y) holds
Kripke–Platek_set_theory
Collection of mathematical objects
Well-orders allow a generalization of mathematical induction, which is called transfinite induction. Given a property (predicate) P ( n ) {\displaystyle
Set_(mathematics)
Ability to readily identify logical or mathematical truth
0169166. PMC 5201307. PMID 28036402. "Intuitive way to understand tree recursion". StackOverflow.com. 2014. "Godel and the Nature of Mathematical Truth
Logical_intuition
Arithmetical concept
can be given a Dialectica interpretation by extending system T with bar recursion. The Dialectica interpretation has been used to build a model of Girard's
Dialectica_interpretation
American logician (born 1938)
born January 18, 1938) is a set theorist, descriptive set theorist, and recursion (computability) theorist, at UCLA. His book Descriptive Set Theory (North-Holland)
Yiannis_N._Moschovakis
Decision tree algorithm
recurse on each subset, considering only attributes never selected before. Recursion on a subset may stop in one of these cases: every element in the subset
ID3_algorithm
Numbers obtained by adding the two previous ones
steps if one avoids recomputing an already computed Fibonacci number (recursion with memoization). Most identities involving Fibonacci numbers can be
Fibonacci_sequence
Order-zero graph or any edgeless graph
for mathematical induction, and similarly, in recursively defined data structures K0 is useful for defining the base case for recursion (by treating the
Null_graph
Necessary condition for optimality associated with dynamic programming
and Meyn 2007. In Markov decision processes, a Bellman equation is a recursion for expected rewards. For example, the expected reward for being in a
Bellman_equation
Logically self-contradictory statement
of paradoxes is non-terminating recursion, in the form of circular reasoning or infinite regress. When this recursion creates a metaphysical impossibility
Paradox
Determination of whether a given program halts for each input
equivalent in expression; any expression involving loops can be written using recursion, and vice versa. Thus the termination of recursive expressions is also
Termination_analysis
Mathematical puzzle game
a rigorous mathematical proof with mathematical induction and is often used as an example of recursion when teaching programming. As in many mathematical
Tower_of_Hanoi
Ordinals in mathematics and set theory
It measures the strength of such systems as "arithmetical transfinite recursion". More generally, Γα enumerates the ordinals that cannot be obtained from
Large_countable_ordinal
Type of neural network which utilizes recursion
Type of neural network which utilizes recursion
Recursive_neural_network
Fast approximate median algorithm
previous step:. Note that pivot calls select; this is an instance of mutual recursion. function pivot(list, left, right) // for 5 or less elements just get
Median_of_medians
Statement of infinite regress
where Locke introduces the story as a trope referring to the problem of induction in philosophical debate. Locke compares one who would say that properties
Turtles_all_the_way_down
Method of machine learning
\mathbb {R} ^{i}} and the sequence c i {\displaystyle c_{i}} satisfies the recursion: c 0 = 0 {\displaystyle c_{0}=0} ( c i ) j = ( c i − 1 ) j , j = 1 , 2
Online_machine_learning
Polynomial ideals are finitely generated
{\mathfrak {a}}\subseteq R[X]} is a non-finitely generated left ideal. Then by recursion (using the axiom of dependent choice) there is a sequence of polynomials
Hilbert's_basis_theorem
Particular class of sets which can be described entirely in terms of simpler sets
z_{n}\in X{\Bigr \}}.} L {\displaystyle L} is defined by transfinite recursion as follows: L 0 := ∅ . {\textstyle L_{0}:=\varnothing .} L α + 1 := Def
Constructible_universe
Subfield of automated reasoning and mathematical logic
tableaux Superposition and term rewriting Model checking Mathematical induction Binary decision diagrams DPLL Higher-order unification Quantifier elimination
Automated_theorem_proving
Axiomatic logical system
is usually denoted Q. Q is PA without the axiom schema of mathematical induction. Q is weaker than PA but it has the same language, and both theories are
Robinson_arithmetic
Concept in computability theory
primitive recursion with the base Σ(x, 0) = 0 and the induction step Σ(x, y+1) = Σ(x, y) + Π( x, y). The product Π is also a primitive recursion with base
Mu_operator
Fixed-point theorem
. For arbitrary A {\displaystyle A} , we use transfinite recursion or transfinite induction to construct the sequences in a similar way. Now, this construction
Bourbaki–Witt_theorem
primitive recursion A form of recursion where a function is defined in terms of itself, using simpler cases, with a base case to stop the recursion. primitive
Glossary_of_logic
recursive function call, it is no longer capable of full μ-recursion, but only primitive recursion. Ackermann's function is the canonical example of a recursive
Loop_variant
Form of logic that allows quantification over predicates
logic. More expressive fragments are defined for any k > 0 by mutual recursion: Σ k + 1 1 {\displaystyle \Sigma _{k+1}^{1}} has the form ∃ R 0 … ∃ R
Second-order_logic
American philosopher and logician (1940–2022)
philosophy of language and mathematics, metaphysics, epistemology, and recursion theory. Kripke made influential and original contributions to logic, especially
Saul_Kripke
INDUCTION RECURSION
INDUCTION RECURSION
Girl/Female
Muslim/Islamic
Intuition inspiration
Girl/Female
Arabic, Assamese, Gujarati, Indian, Kannada, Muslim
Intuition
Girl/Female
Indian
A small indication one that forms in the cheeks when one smiles
Boy/Male
Gujarati, Hindu, Indian, Jain, Kannada, Malayalam, Marathi, Sanskrit, Telugu
Indication; Signal; Hint
Girl/Female
Hindu, Indian, Kannada, Marathi, Sanskrit, Tamil, Telugu
Intuition
Girl/Female
Tamil
A small indication one that forms in the cheeks when one smiles
Male
African
an indication, a sign.
Girl/Female
Tamil
A small indication one that forms in the cheeks when one smiles
Girl/Female
Tamil
Nidhyana | நிதà¯à®¯à®¾à®¨à®¾
Intuition
Nidhyana | நிதà¯à®¯à®¾à®¨à®¾
Girl/Female
Tamil
Dimple | டீமà¯à®ªà®²Â Â
A small indication one that forms in the cheeks when one smiles
Dimple | டீமà¯à®ªà®²Â Â
Boy/Male
Arabic, Muslim, Urdu
Intuition; Conjecture; Wisdom
Girl/Female
Muslim
Intuition. Inspiration.
Girl/Female
Indian
A small indication one that forms in the cheeks when one smiles
Girl/Female
Indian
Intuition, Inspiraction, Reavaluction
Girl/Female
Indian
A small indication one that forms in the cheeks when one smiles
Boy/Male
Muslim
Intuition, Conjecture, Wisdom
Girl/Female
Muslim
Intuition, Inspiraction, Reavaluction
Girl/Female
Hindu, Indian
Queen of Horizon; Injection
Boy/Male
Hindu, Indian, Kannada, Telugu
Command; Indication
Girl/Female
Arabic, Muslim
Intuition
INDUCTION RECURSION
INDUCTION RECURSION
Girl/Female
Tamil
Cool, Rock
Boy/Male
Latin
Killed Turnus.
Boy/Male
Arabic
Nature; Creation
Surname or Lastname
English
English : habitational name, possibly from Ramsdell in Hampshire, but more likely from Ramsdale, a place in North Yorkshire, named from Old English hramsa ‘wild garlic’ (or possibly the genitive case of the byname Ram(m) ‘ram’) + dæl ‘valley’, or from Ramsdale Farm in Arnold, Nottinghamshire. Compare Ransdell.
Boy/Male
Scandinavian Scottish
Church.
Boy/Male
Sanskrit American Gaelic Irish
Ascending.
Biblical
the father's joy,father, i.e. source, of joy
Boy/Male
Hindu
Bird
Boy/Male
Indian
Universe
Boy/Male
Muslim
Jewel or gem (1)
INDUCTION RECURSION
INDUCTION RECURSION
INDUCTION RECURSION
INDUCTION RECURSION
INDUCTION RECURSION
n.
Act of deducting or taking away; subtraction; as, the deduction of the subtrahend from the minuend.
n.
The action by which the parts of the body are drawn towards its axis]; -- opposed to abduction.
n.
That which is deducted; the part taken away; abatement; as, a deduction from the yearly rent.
n.
The act or process of inducting or bringing in; introduction; entrance; beginning; commencement.
n.
A process of demonstration in which a general truth is gathered from an examination of particular cases, one of which is known to be true, the examination being so conducted that each case is made to depend on the preceding one; -- called also successive induction.
a.
Pertaining to, or proceeding by, induction; inductive.
n.
An induction coil.
a.
Leading to inferences; proceeding by, derived from, or using, induction; as, inductive reasoning.
n.
The act of reducing, or state of being reduced; conversion to a given state or condition; diminution; conquest; as, the reduction of a body to powder; the reduction of things to order; the reduction of the expenses of government; the reduction of a rebellious province.
a.
Operating by induction; as, an inductive electrical machine.
n.
A specimen prepared by injection.
n.
That which taints or corrupts morally; as, the infection of vicious principles.
n.
The wrongful, and usually the forcible, carrying off of a human being; as, the abduction of a child, the abduction of an heiress.
a.
Rendered electro-polar by induction, or brought into the opposite electrical state by the influence of inductive bodies.
n.
Induction.
v. t.
The act, process, or result of reducing; as, the reduction of iron from its ores; the reduction of aldehyde from alcohol.
a.
Knowing, or perceiving, by intuition; capable of knowing without deduction or reasoning.
n.
The act or process of inferring by deduction or induction.
a.
Facilitating induction; susceptible of being acted upon by induction; as certain substances have a great inductive capacity.