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There is a complete set of arithmetic functions for performing arithmetic operations with domain elements:

!:zerop(a) | test a = 0 |

!:plus(a,b) | a + b |

!:difference(a,b) | a - b |

!:minus(a) | -a |

!:minusp(a) | test a < 0 |

!:times(a,b) | a * b |

!:quotient(a,b) | a∕b |

!:recip(a) | 1∕b |

!:expt(a,n) | a^{n} |

!:gcd(a,b) | greatestcommondivisorof (a,b) |

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