*PicoSecond* | *documentation* Submultiple of *SecondDuration*. Symbol: ps. A UnitOfMeasure *equal* to one trillionth of a *SecondDuration* | |

**has axiom** (*equal* (*MeasureFn* ?NUMBER *PicoSecond*) (*MeasureFn* (*MultiplicationFn* ?NUMBER 1.0E-12) *SecondDuration*))
| |

**is an ***instance* of TimeDuration | |

**is an ***instance* of UnitOfMeasure | |

TimeDuration | **is second ***domain* of age | |

**is second ***domain* of *duration* | |

**is second ***domain* of *frequency* | |

UnitOfMeasure | **is second ***domain* of *MeasureFn* | |

PhysicalQuantity | **is partitioned into** ConstantQuantity, FunctionQuantity | |

ConstantQuantity | **is first ***domain* of *MagnitudeFn* | |

Quantity | **is first ***domain* of *AdditionFn* | |

**is first ***domain* of *DivisionFn* | |

**is first ***domain* of *ExponentiationFn* | |

**is first ***domain* of *greaterThan* | |

**is first ***domain* of *greaterThanOrEqualTo* | |

**is first ***domain* of *lessThan* | |

**is first ***domain* of *lessThanOrEqualTo* | |

**is first ***domain* of *MaxFn* | |

**is first ***domain* of *MinFn* | |

**is first ***domain* of *MultiplicationFn* | |

**is first ***domain* of *ReciprocalFn* | |

**is first ***domain* of *RemainderFn* | |

**is first ***domain* of *RoundFn* | |

**is first ***domain* of *SubtractionFn* | |

Abstract | **is ***disjoint* from Physical | |