ఒకటి: కూర్పుల మధ్య తేడాలు

చి Wikipedia python library
చి Wikipedia python library
పంక్తి 341:
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Defining a prime as a number that is only divisible by one and itself, one ''is'' a prime. However, for purposes of [[factorization]] and especially the [[fundamental theorem of arithmetic]], it is more convenient to not think of one as a prime factor, or to think of it as an implicit factor that's always there but need not be written down. To exclude the number one from the list of prime numbers, primality is defined as a number having exactly two distinct positive divisors, one and itself. The last professional [[mathematician]] to publicly label 1 a prime number was [[Henri Lebesgue]] in 1899. ([[Carl Sagan]] included one in a list of prime numbers in his book ''Contact'' in 1985.)
 
One is one of three possible return values of the [[Möbius function]]. Passed an integer that is [[square-free integer|square-free]] with an even number of distinct prime factors, the Möbius function returns one.
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