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Quantity | 438 | Any specification of how many or how much of something there is. Accordingly, there are two subclas... | ^ |

Number | 19 | A measure of how many things there are, or how much there is, of a certain kind. Numbers are subc... | ^ |

RealNumber | 15 | Any Number that can be expressed as a (possibly infinite) decimal, i.e. any Number that has a p... | ^ |

ImaginaryNumber | . | Any Number that is the result of multiplying a RealNumber by the square root of -1. | ^ |

ComplexNumber | . | A Number that has the form: x + yi, where x and y are RealNumbers and i is the square root of -... | ^ |

MultipoleVariable | . | a variable that describes energetical interactions between multipoles. | ^ |