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Parents 
数 
A measure of how many things there are, or how much there is, of a certain kind. Numbers are subclassed into RealNumber, ComplexNumber, and ImaginaryNumber.

Children 
2進数  Elements from the number system with base 2. Every BinaryNumber is expressed as a sequence of the digits 1 and 0. 
 無理数  Any RealNumber that is not also a RationalNumber. 
 負の実数  A RealNumber that is less than zero. 
 非負実数  A RealNumber that is greater than or equal to zero. 
 有理数  Any RealNumber that is the product of dividing two Integers. 