## lustrec / test / src / kind_fmcad08 / misc / durationThm_2_e7_145_e3_222.lus @ 22fe1c93

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node Sofar( X : bool ) returns ( Sofar : bool ); |

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let |

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Sofar = X -> X or pre Sofar; |

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tel |

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node Age (p: bool) returns (age_of_p: int); |

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let |

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age_of_p = 0 -> if pre(p) then pre(age_of_p) - 1 else 0; |

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tel |

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node top (k0: int; p, q, r, t : bool) returns (OK: bool); |

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var k: int; |

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env : bool; |

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let |

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k = k0-> pre(k); |

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env = Sofar((k>=1) and (Age(p)>=k => q) and (Age(r)>=k => t)); |

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OK = env => ((Age(p and r)>=k) => (q and t)); |

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--%MAIN; |

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--%PROPERTY OK=true; |

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tel |