Computability theory | Theorems in the foundations of mathematics

Kleene's recursion theorem

In computability theory, Kleene's recursion theorems are a pair of fundamental results about the application of computable functions to their own descriptions. The theorems were first proved by Stephen Kleene in 1938 and appear in his 1952 book Introduction to Metamathematics. A related theorem, which constructs fixed points of a computable function, is known as Rogers's theorem and is due to Hartley Rogers, Jr. The recursion theorems can be applied to construct fixed points of certain operations on computable functions, to generate quines, and to construct functions defined via recursive definitions. (Wikipedia).

Video thumbnail

Makoto Fujiwara: Bar theorem and bar recursion for continuous functions with continuous modulus

The lecture was held within the framework of the Hausdorff Trimester Program: Constructive Mathematics. Abstract: (joint work with Tatsuji Kawai) Bar induction is originally discussed by L. E. J. Brouwer under the name of “bar theorem” in his intuitionistic mathematics but first formali

From playlist Workshop: "Constructive Mathematics"

Video thumbnail

Applying the recursive formula to a sequence to determine the first five terms

👉 Learn all about recursive sequences. Recursive form is a way of expressing sequences apart from the explicit form. In the recursive form of defining sequences, each term of a sequence is expressed in terms of the preceding term unlike in the explicit form where each term is expressed in

From playlist Sequences

Video thumbnail

Paulo Oliva: On a Dialectica like version of Kleene numerical realizability

The lecture was held within the framework of the Hausdorff Trimester Program: Types, Sets and Constructions. Abstract: Kleene's original notion of realizability (1945) makes use of all (partial) computable functions as potential realisers. Later Kreisel (1959) presented a "modified" notio

From playlist Workshop: "Proofs and Computation"

Video thumbnail

Michael Rathjen: The Ubiquity of Schütte's Search Trees

The lecture was held within the framework of the Hausdorff Trimester Program: Types, Sets and Constructions. Abstract: Progressions of theories along paths through Kleene's $\mathcal O$, adding the consistency of the previous theory at every successor step, can deduce every true $\Pi^0_1$

From playlist Workshop: "Proof, Computation, Complexity"

Video thumbnail

How to use the recursive formula to evaluate the first five terms

👉 Learn all about recursive sequences. Recursive form is a way of expressing sequences apart from the explicit form. In the recursive form of defining sequences, each term of a sequence is expressed in terms of the preceding term unlike in the explicit form where each term is expressed in

From playlist Sequences

Video thumbnail

Using the recursive formula to find the first four terms of a sequence

👉 Learn all about recursive sequences. Recursive form is a way of expressing sequences apart from the explicit form. In the recursive form of defining sequences, each term of a sequence is expressed in terms of the preceding term unlike in the explicit form where each term is expressed in

From playlist Sequences

Video thumbnail

10.2.6 Computability, Universality

MIT 6.004 Computation Structures, Spring 2017 Instructor: Chris Terman View the complete course: https://ocw.mit.edu/6-004S17 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP62WVs95MNq3dQBqY2vGOtQ2 10.2.6 Computability, Universality License: Creative Commons BY-NC-SA M

From playlist MIT 6.004 Computation Structures, Spring 2017

Video thumbnail

How to find the first four terms of a recursive formula

👉 Learn all about recursive sequences. Recursive form is a way of expressing sequences apart from the explicit form. In the recursive form of defining sequences, each term of a sequence is expressed in terms of the preceding term unlike in the explicit form where each term is expressed in

From playlist Sequences

Video thumbnail

How to determine the first five terms for a recursive sequence

👉 Learn all about recursive sequences. Recursive form is a way of expressing sequences apart from the explicit form. In the recursive form of defining sequences, each term of a sequence is expressed in terms of the preceding term unlike in the explicit form where each term is expressed in

From playlist Sequences

Video thumbnail

Discrete Math - 2.4.2 Recurrence Relations

What is a recurrence relation, and how can we write it as a closed function? Textbook: Rosen, Discrete Mathematics and Its Applications, 7e Playlist: https://www.youtube.com/playlist?list=PLl-gb0E4MII28GykmtuBXNUNoej-vY5Rz

From playlist Discrete Math I (Entire Course)

Video thumbnail

Applying the recursive formula to a geometric sequence

👉 Learn all about recursive sequences. Recursive form is a way of expressing sequences apart from the explicit form. In the recursive form of defining sequences, each term of a sequence is expressed in terms of the preceding term unlike in the explicit form where each term is expressed in

From playlist Sequences

Video thumbnail

How to find a geometric rule for a recursive sequence

👉 Learn all about recursive sequences. Recursive form is a way of expressing sequences apart from the explicit form. In the recursive form of defining sequences, each term of a sequence is expressed in terms of the preceding term unlike in the explicit form where each term is expressed in

From playlist Sequences

Video thumbnail

IMS Public Lecture : Waking Up from Leibniz' Dream: On the Unmechanizability of Truth

Denis Hirschfeldt, The University of Chicago, USA

From playlist Public Lectures

Video thumbnail

Determining the first five terms of a geometric recursive formula

👉 Learn all about recursive sequences. Recursive form is a way of expressing sequences apart from the explicit form. In the recursive form of defining sequences, each term of a sequence is expressed in terms of the preceding term unlike in the explicit form where each term is expressed in

From playlist Sequences

Video thumbnail

Hugo Herbelin: Computing with Markov's principle

The lecture was held within the framework of the Hausdorff Trimester Program: Types, Sets and Constructions. Abstract: Computing with Markov's principle via a realizability interpretation is standard, using unbounded search as in Kleene's realizability or by selecting the first valid wit

From playlist Workshop: "Proofs and Computation"

Video thumbnail

Foundations - Seminar 14 - Gödel's incompleteness theorem Part 6

Billy Price and Will Troiani present a series of seminars on foundations of mathematics. In this seminar Will Troiani continues with the proof of Gödel's incompleteness theorem. You can join this seminar from anywhere, on any device, at https://www.metauni.org. This video was filmed in D

From playlist Foundations seminar

Video thumbnail

Foundations - Seminar 11 - Gödel's incompleteness theorem Part 3

Billy Price and Will Troiani present a series of seminars on foundations of mathematics. In this seminar Will Troiani continues with the proof of Gödel's incompleteness theorem, discussing Gödel's beta function and the role of the Chinese Remainder theorem in the incompleteness theorem. Y

From playlist Foundations seminar

Video thumbnail

Learn how to find the first five terms of a sequence using the recursive formula

👉 Learn all about recursive sequences. Recursive form is a way of expressing sequences apart from the explicit form. In the recursive form of defining sequences, each term of a sequence is expressed in terms of the preceding term unlike in the explicit form where each term is expressed in

From playlist Sequences

Related pages

Fixed point (mathematics) | Lambda calculus | Quine (computing) | Computable function | Factorial | Kleene fixed-point theorem | Enumeration reducibility | Recursive definition | Denotational semantics | Stephen Cole Kleene | Diagonal lemma | Computability theory | Turing machine | Halting problem | Order theory | Admissible numbering | Fixed-point combinator | Smn theorem | Partial function | Turing degree