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4 - Wikipedia There are four elementary arithmetic operations in mathematics: addition (+), subtraction (−), multiplication (×), and division (÷) [4] Lagrange's four-square theorem states that every positive integer can be written as the sum of at most four squares [5][6] Four is one of four all-Harshad numbers Each natural number divisible by 4 is a difference of squares of two natural numbers, i e
Four - definition of four by The Free Dictionary 1 a cardinal number, three plus one 2 a symbol of this number, 4 or IV or IIII 3 a set of this many persons or things 4 a an automobile powered by a four-cylinder engine b the engine itself 5 amounting to four in number
4 (number) - Simple English Wikipedia, the free encyclopedia In mathematics, the number four is an even number and the smallest composite number Four is also the second square number after one A small minority of people have four fingers on each hand and four toes on each foot [source?] Four squared is 16, and four doubled is 8