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(* ========================================================================= *)
(* THE RESOLUTION PROOF PROCEDURE *)
(* Copyright (c) 2001 Joe Leslie-Hurd, distributed under the BSD License *)
(* ========================================================================= *)
signature Resolution =
sig
(* ------------------------------------------------------------------------- *)
(* A type of resolution proof procedures. *)
(* ------------------------------------------------------------------------- *)
type parameters =
{active : Active.parameters,
waiting : Waiting.parameters}
type resolution
(* ------------------------------------------------------------------------- *)
(* Basic operations. *)
(* ------------------------------------------------------------------------- *)
val default : parameters
val new :
parameters -> {axioms : Thm.thm list, conjecture : Thm.thm list} ->
resolution
val active : resolution -> Active.active
val waiting : resolution -> Waiting.waiting
val pp : resolution Print.pp
(* ------------------------------------------------------------------------- *)
(* The main proof loop. *)
(* ------------------------------------------------------------------------- *)
datatype decision =
Contradiction of Thm.thm
| Satisfiable of Thm.thm list
datatype state =
Decided of decision
| Undecided of resolution
val iterate : resolution -> state
val loop : resolution -> decision
end
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