Perfect Number

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In mathematics, a perfect number is a positive integer that is the sum of its proper positive divisors, that is, the sum of the positive divisors excluding the number itself. Equivalently, a perfect number is a number that is half the sum of all of its positive divisors, or ¿(n) = 2n.Being negative or non-negative is a property of a number which is real, or a member of a subset of real numbers such as rational and integer numbers. A negative number is one that is less than zero, such as ¿{sqrt{2}}, ¿1.414, ¿1. A positive number (e.g., positive real number, positive rational number, positive integer) is one that is greater than zero, such as {sqrt{2}}, 1.414, 1. Zero itself is neither positive nor negative

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Pagina's: 132, Paperback, Betascript Publishers