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src/Sequents/LK.thy

author | paulson |

Tue, 27 Jul 1999 18:52:48 +0200 | |

changeset 7094 | 6f18ae72a90e |

parent 6456 | 23602e214ebf |

child 7117 | 37eccadf6b8a |

permissions | -rw-r--r-- |

a new theory containing just an axiom needed to derive imp_cong

(* Title: LK/LK ID: $Id$ Author: Lawrence C Paulson, Cambridge University Computer Laboratory Copyright 1993 University of Cambridge Axiom to express monotonicity (a variant of the deduction theorem). Makes the link between |- and ==>, needed for instance to prove imp_cong. CANNOT be added to LK0.thy because modal logic is built upon it, and various modal rules would become inconsistent. *) LK = LK0 + rules monotonic "($H |- P ==> $H |- Q) ==> $H, P |- Q" end