18 relations: Cartesian product, Communications of the ACM, Comparison sort, Computer science, Elwyn Berlekamp, Fare, Fast Fourier transform, Integer sorting, List of unsolved problems in computer science, Michael Fredman, Non-constructive algorithm existence proofs, Ordered pair, Random-access machine, Shortest path problem, Sorting algorithm, Time complexity, Word (computer architecture), 3SUM.

## Cartesian product

In mathematics, a Cartesian product is a mathematical operation which returns a set (or product set or simply product) from multiple sets.

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## Communications of the ACM

Communications of the ACM is the monthly magazine of the Association for Computing Machinery (ACM).

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## Comparison sort

A comparison sort is a type of sorting algorithm that only reads the list elements through a single abstract comparison operation (often a "less than or equal to" operator or a three-way comparison) that determines which of two elements should occur first in the final sorted list.

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## Computer science

Computer science deals with the theoretical foundations of information and computation, together with practical techniques for the implementation and application of these foundations Computer science is the scientific and practical approach to computation and its applications.

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## Elwyn Berlekamp

Elwyn Ralph Berlekamp (born September 6, 1940) is an American mathematician.

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## Fare

A fare is the fee paid by a passenger for use of a public transport system: rail, bus, taxi, etc.

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## Fast Fourier transform

A fast Fourier transform (FFT) algorithm computes the discrete Fourier transform (DFT) of a sequence, or its inverse.

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## Integer sorting

In computer science, integer sorting is the algorithmic problem of sorting a collection of data values by numeric keys, each of which is an integer.

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## List of unsolved problems in computer science

This article is a list of unsolved problems in computer science.

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## Michael Fredman

Michael Lawrence Fredman is a professor at the Computer Science Department at Rutgers University, United States.

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## Non-constructive algorithm existence proofs

The vast majority of positive results about computational problems are constructive proofs, i.e., a computational problem is proved to be solvable by showing an algorithm that solves it; a computational problem is shown to be in P (complexity) by showing an algorithm that solves it in time that is polynomial in the size of the input; etc.

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## Ordered pair

In mathematics, an ordered pair (a, b) is a pair of mathematical objects.

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## Random-access machine

In computer science, random-access machine (RAM) is an abstract machine in the general class of register machines.

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## Shortest path problem

In graph theory, the shortest path problem is the problem of finding a path between two vertices (or nodes) in a graph such that the sum of the weights of its constituent edges is minimized.

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## Sorting algorithm

A sorting algorithm is an algorithm that puts elements of a list in a certain order.

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## Time complexity

In computer science, the time complexity of an algorithm quantifies the amount of time taken by an algorithm to run as a function of the length of the string representing the input.

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## Word (computer architecture)

In computing, word is a term for the natural unit of data used by a particular processor design.

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## 3SUM

In computational complexity theory, the 3SUM problem asks if a given set of n real numbers contains three elements that sum to zero.

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