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# Four fours

Four fours is a mathematical puzzle. 

Addition (often signified by the plus symbol "+") is one of the four basic operations of arithmetic; the others are subtraction, multiplication and division.

## Bracket

A bracket is a tall punctuation mark typically used in matched pairs within text, to set apart or interject other text.

## Cube root

In mathematics, a cube root of a number x is a number y such that y3.

## Cubic function

In algebra, a cubic function is a function of the form in which is nonzero.

## David A. Wheeler

David A. Wheeler (born 1965) is a computer scientist.

## Derangement

In combinatorial mathematics, a derangement is a permutation of the elements of a set, such that no element appears in its original position.

## Division (mathematics)

Division is one of the four basic operations of arithmetic, the others being addition, subtraction, and multiplication.

## Elementary arithmetic

Elementary arithmetic is the simplified portion of arithmetic that includes the operations of addition, subtraction, multiplication, and division.

## Exponentiation

Exponentiation is a mathematical operation, written as, involving two numbers, the base and the exponent.

## Expression (mathematics)

In mathematics, an expression or mathematical expression is a finite combination of symbols that is well-formed according to rules that depend on the context.

## Factorial

In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, The value of 0! is 1, according to the convention for an empty product.

## Gamma function

In mathematics, the gamma function (represented by, the capital Greek alphabet letter gamma) is an extension of the factorial function, with its argument shifted down by 1, to real and complex numbers.

## Hash table

In computing, a hash table (hash map) is a data structure that implements an associative array abstract data type, a structure that can map keys to values.

## Knowledge (magazine)

Knowledge: An Illustrated Magazine of Science was a British popular science magazine published from 1881 to 1918.

## Krypto (game)

Krypto is a card game designed by Daniel Yovich in 1963 and published by Parker Brothers and It is a mathematical game that promotes proficiency with basic arithmetic operations.

## Logarithm

In mathematics, the logarithm is the inverse function to exponentiation.

## Mathematical puzzle

Mathematical puzzles make up an integral part of recreational mathematics.

## Memoization

In computing, memoization or memoisation is an optimization technique used primarily to speed up computer programs by storing the results of expensive function calls and returning the cached result when the same inputs occur again.

## Multiplication

Multiplication (often denoted by the cross symbol "×", by a point "⋅", by juxtaposition, or, on computers, by an asterisk "∗") is one of the four elementary mathematical operations of arithmetic; with the others being addition, subtraction and division.

## Multiplicative inverse

In mathematics, a multiplicative inverse or reciprocal for a number x, denoted by 1/x or x&minus;1, is a number which when multiplied by x yields the multiplicative identity, 1.

## Natural number

In mathematics, the natural numbers are those used for counting (as in "there are six coins on the table") and ordering (as in "this is the third largest city in the country").

## Percentage

In mathematics, a percentage is a number or ratio expressed as a fraction of 100.

## Repeating decimal

A repeating or recurring decimal is decimal representation of a number whose digits are periodic (repeating its values at regular intervals) and the infinitely-repeated portion is not zero.

## Richard A. Proctor

Richard Anthony Proctor (23 March 1837 – 12 September 1888) was an English astronomer.

## Square (algebra)

In mathematics, a square is the result of multiplying a number by itself.

## Square root

In mathematics, a square root of a number a is a number y such that; in other words, a number y whose square (the result of multiplying the number by itself, or) is a. For example, 4 and −4 are square roots of 16 because.

## Subtraction

Subtraction is an arithmetic operation that represents the operation of removing objects from a collection.

## Successor function

In mathematics, the successor function or successor operation is a primitive recursive function S such that S(n).

## W. W. Rouse Ball

Walter William Rouse Ball, known as W. W. Rouse Ball (14 August 1850 – 4 April 1925), was a British mathematician, lawyer, and fellow at Trinity College, Cambridge from 1878 to 1905.

## 4

4 (four) is a number, numeral, and glyph.

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## References

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